21621555034204 has 6 divisors (see below), whose sum is σ = 37837721309864. Its totient is φ = 10810777517100.

The previous prime is 21621555034103. The next prime is 21621555034207. The reversal of 21621555034204 is 40243055512612.

21621555034204 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21621555034204² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621555034207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2702694379272 + ... + 2702694379279.

Almost surely, 2^{21621555034204} is an apocalyptic number.

It is an amenable number.

21621555034204 is a deficient number, since it is larger than the sum of its proper divisors (16216166275660).

21621555034204 is a wasteful number, since it uses less digits than its factorization.

21621555034204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5405388758555 (or 5405388758553 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 21621555034204 in words is "twenty-one trillion, six hundred twenty-one billion, five hundred fifty-five million, thirty-four thousand, two hundred four".