21256020030654 has 12 divisors (see below), whose sum is σ = 46054710066456. Its totient is φ = 7085340010212.

The previous prime is 21256020030649. The next prime is 21256020030673. The reversal of 21256020030654 is 45603002065212.

21256020030654 is a `hidden beast` number, since 2 + 1 + 2 + 560 + 2 + 0 + 0 + 30 + 65 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 590445000834 + ... + 590445000869.

It is an arithmetic number, because the mean of its divisors is an integer number (3837892505538).

Almost surely, 2^{21256020030654} is an apocalyptic number.

21256020030654 is an abundant number, since it is smaller than the sum of its proper divisors (24798690035802).

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

21256020030654 is a wasteful number, since it uses less digits than its factorization.

21256020030654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180890001711 (or 1180890001708 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 21256020030654 its reverse (45603002065212), we get a palindrome (66859022095866).

The spelling of 21256020030654 in words is "twenty-one trillion, two hundred fifty-six billion, twenty million, thirty thousand, six hundred fifty-four".