21601677031240 has 32 divisors (see below), whose sum is σ = 48607387925760. Its totient is φ = 8640028216000.

The previous prime is 21601677031219. The next prime is 21601677031243. The reversal of 21601677031240 is 4213077610612.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 21601677031193 and 21601677031202.

It is not an unprimeable number, because it can be changed into a prime (21601677031243) 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 7 ways as a sum of consecutive naturals, for example, 19536376 + ... + 20612455.

It is an arithmetic number, because the mean of its divisors is an integer number (1518980872680).

Almost surely, 2^{21601677031240} is an apocalyptic number.

21601677031240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21601677031240 is an abundant number, since it is smaller than the sum of its proper divisors (27005710894520).

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

21601677031240 is a wasteful number, since it uses less digits than its factorization.

21601677031240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40162293 (or 40162289 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 21601677031240 in words is "twenty-one trillion, six hundred one billion, six hundred seventy-seven million, thirty-one thousand, two hundred forty".