21412402136040 has 128 divisors (see below), whose sum is σ = 64567035187200. Its totient is φ = 5680726053120.

The previous prime is 21412402136029. The next prime is 21412402136051. The reversal of 21412402136040 is 4063120421412.

It is an interprime number because it is at equal distance from previous prime (21412402136029) and next prime (21412402136051).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21412402135989 and 21412402136007.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18969841 + ... + 20066879.

It is an arithmetic number, because the mean of its divisors is an integer number (504429962400).

Almost surely, 2^{21412402136040} is an apocalyptic number.

21412402136040 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 21412402136040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32283517593600).

21412402136040 is an abundant number, since it is smaller than the sum of its proper divisors (43154633051160).

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

21412402136040 is a wasteful number, since it uses less digits than its factorization.

21412402136040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097887 (or 1097883 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 21412402136040 its reverse (4063120421412), we get a palindrome (25475522557452).

The spelling of 21412402136040 in words is "twenty-one trillion, four hundred twelve billion, four hundred two million, one hundred thirty-six thousand, forty".