21021114204 has 18 divisors (see below), whose sum is σ = 53136705440. Its totient is φ = 7007038056.

The previous prime is 21021114199. The next prime is 21021114221. The reversal of 21021114204 is 40241112012.

21021114204 is a `hidden beast` number, since 210 + 21 + 11 + 420 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21021114204² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 291959884 + ... + 291959955.

Almost surely, 2^21021114204 is an apocalyptic number.

It is an amenable number.

21021114204 is an abundant number, since it is smaller than the sum of its proper divisors (32115591236).

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

21021114204 is a wasteful number, since it uses less digits than its factorization.

21021114204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583919849 (or 583919844 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21021114204 its reverse (40241112012), we get a palindrome (61262226216).

The spelling of 21021114204 in words is "twenty-one billion, twenty-one million, one hundred fourteen thousand, two hundred four".