21122020204 has 12 divisors (see below), whose sum is σ = 36964662784. Its totient is φ = 10560687984.

The previous prime is 21122020189. The next prime is 21122020219. The reversal of 21122020204 is 40202022112.

It is an interprime number because it is at equal distance from previous prime (21122020189) and next prime (21122020219).

It is a super-2 number, since 2×21122020204² (a number of 21 digits) contains 22 as substring.

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, 125674 + ... + 240910.

Almost surely, 2^21122020204 is an apocalyptic number.

It is an amenable number.

21122020204 is a deficient number, since it is larger than the sum of its proper divisors (15842642580).

21122020204 is a wasteful number, since it uses less digits than its factorization.

21122020204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161064 (or 161062 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21122020204 its reverse (40202022112), we get a palindrome (61324042316).

The spelling of 21122020204 in words is "twenty-one billion, one hundred twenty-two million, twenty thousand, two hundred four".