20021222100 has 72 divisors (see below), whose sum is σ = 63194267808. Its totient is φ = 4853628800.

The previous prime is 20021222083. The next prime is 20021222119. The reversal of 20021222100 is 122212002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3030219 + ... + 3036818.

It is an arithmetic number, because the mean of its divisors is an integer number (877698164).

Almost surely, 2^20021222100 is an apocalyptic number.

20021222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021222100 is an abundant number, since it is smaller than the sum of its proper divisors (43173045708).

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

20021222100 is a wasteful number, since it uses less digits than its factorization.

20021222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6067065 (or 6067058 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20021222100 its reverse (122212002), we get a palindrome (20143434102).

The spelling of 20021222100 in words is "twenty billion, twenty-one million, two hundred twenty-two thousand, one hundred".