21022020108 has 72 divisors (see below), whose sum is σ = 53531223200. Its totient is φ = 6955787520.

The previous prime is 21022020101. The next prime is 21022020119. The reversal of 21022020108 is 80102022012.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21022020101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3270738 + ... + 3277158.

Almost surely, 2^21022020108 is an apocalyptic number.

It is an amenable number.

21022020108 is an abundant number, since it is smaller than the sum of its proper divisors (32509203092).

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

21022020108 is a wasteful number, since it uses less digits than its factorization.

21022020108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7087 (or 7082 counting only the distinct ones).

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

The spelling of 21022020108 in words is "twenty-one billion, twenty-two million, twenty thousand, one hundred eight".