21155124032040 has 32 divisors (see below), whose sum is σ = 63465372096480. Its totient is φ = 5641366408512.

The previous prime is 21155124031991. The next prime is 21155124032071. The reversal of 21155124032040 is 4023042155112.

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 = 21155124031989 and 21155124032007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88146350014 + ... + 88146350253.

It is an arithmetic number, because the mean of its divisors is an integer number (1983292878015).

Almost surely, 2^{21155124032040} is an apocalyptic number.

21155124032040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21155124032040 is an abundant number, since it is smaller than the sum of its proper divisors (42310248064440).

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

21155124032040 is a wasteful number, since it uses less digits than its factorization.

21155124032040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176292700281 (or 176292700277 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21155124032040 its reverse (4023042155112), we get a palindrome (25178166187152).

The spelling of 21155124032040 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred twenty-four million, thirty-two thousand, forty".