2101231240040 has 96 divisors (see below), whose sum is σ = 4850383667040. Its totient is φ = 819233057280.

The previous prime is 2101231240019. The next prime is 2101231240049. The reversal of 2101231240040 is 400421321012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2101231239994 and 2101231240021.

It is not an unprimeable number, because it can be changed into a prime (2101231240049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75496607 + ... + 75524433.

It is an arithmetic number, because the mean of its divisors is an integer number (50524829865).

Almost surely, 2^{2101231240040} is an apocalyptic number.

2101231240040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2101231240040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2425191833520).

2101231240040 is an abundant number, since it is smaller than the sum of its proper divisors (2749152427000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2101231240040 is a wasteful number, since it uses less digits than its factorization.

2101231240040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29043 (or 28998 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 2101231240040 its reverse (400421321012), we get a palindrome (2501652561052).

The spelling of 2101231240040 in words is "two trillion, one hundred one billion, two hundred thirty-one million, two hundred forty thousand, forty".