21506065710104 has 64 divisors (see below), whose sum is σ = 42268749091200. Its totient is φ = 10247835225600.

The previous prime is 21506065710079. The next prime is 21506065710119. The reversal of 21506065710104 is 40101756060512.

It is a super-2 number, since 2×21506065710104² (a number of 27 digits) contains 22 as substring.

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, 1823594 + ... + 6807174.

It is an arithmetic number, because the mean of its divisors is an integer number (660449204550).

Almost surely, 2^{21506065710104} is an apocalyptic number.

It is an amenable number.

21506065710104 is a deficient number, since it is larger than the sum of its proper divisors (20762683381096).

21506065710104 is a wasteful number, since it uses less digits than its factorization.

21506065710104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4983924 (or 4983920 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 21506065710104 in words is "twenty-one trillion, five hundred six billion, sixty-five million, seven hundred ten thousand, one hundred four".