21054561004 has 12 divisors (see below), whose sum is σ = 37540679904. Its totient is φ = 10328652464.

The previous prime is 21054560987. The next prime is 21054561083. The reversal of 21054561004 is 40016545012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49656772 + ... + 49657195.

It is an arithmetic number, because the mean of its divisors is an integer number (3128389992).

Almost surely, 2^21054561004 is an apocalyptic number.

It is an amenable number.

21054561004 is a deficient number, since it is larger than the sum of its proper divisors (16486118900).

21054561004 is a wasteful number, since it uses less digits than its factorization.

21054561004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99314024 (or 99314022 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21054561004 in words is "twenty-one billion, fifty-four million, five hundred sixty-one thousand, four".