21155154451602 has 64 divisors (see below), whose sum is σ = 44512405666560. Its totient is φ = 6693087340800.

The previous prime is 21155154451591. The next prime is 21155154451637. The reversal of 21155154451602 is 20615445155112.

It is a super-2 number, since 2×21155154451602² (a number of 27 digits) contains 22 as substring.

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, 17906563 + ... + 19051385.

It is an arithmetic number, because the mean of its divisors is an integer number (695506338540).

Almost surely, 2^{21155154451602} is an apocalyptic number.

21155154451602 is an abundant number, since it is smaller than the sum of its proper divisors (23357251214958).

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

21155154451602 is a wasteful number, since it uses less digits than its factorization.

21155154451602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146659.

The product of its (nonzero) digits is 240000, while the sum is 42.

The spelling of 21155154451602 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-four million, four hundred fifty-one thousand, six hundred two".