21102015366004 has 48 divisors (see below), whose sum is σ = 38778998569920. Its totient is φ = 10034035038720.

The previous prime is 21102015365999. The next prime is 21102015366037. The reversal of 21102015366004 is 40066351020112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123909 + ... + 6497644.

It is an arithmetic number, because the mean of its divisors is an integer number (807895803540).

Almost surely, 2^{21102015366004} is an apocalyptic number.

It is an amenable number.

21102015366004 is a deficient number, since it is larger than the sum of its proper divisors (17676983203916).

21102015366004 is a wasteful number, since it uses less digits than its factorization.

21102015366004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622000 (or 6621998 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 21102015366004 its reverse (40066351020112), we get a palindrome (61168366386116).

The spelling of 21102015366004 in words is "twenty-one trillion, one hundred two billion, fifteen million, three hundred sixty-six thousand, four".