21022100022 has 64 divisors (see below), whose sum is σ = 52450136064. Its totient is φ = 5457015840.

The previous prime is 21022100009. The next prime is 21022100053. The reversal of 21022100022 is 22000122012.

It is a junction number, because it is equal to n+sod(n) for n = 21022099980 and 21022100007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 812863 + ... + 838325.

It is an arithmetic number, because the mean of its divisors is an integer number (819533376).

Almost surely, 2^21022100022 is an apocalyptic number.

21022100022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21022100022 is an abundant number, since it is smaller than the sum of its proper divisors (31428036042).

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

21022100022 is a wasteful number, since it uses less digits than its factorization.

21022100022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27273.

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

Adding to 21022100022 its reverse (22000122012), we get a palindrome (43022222034).

The spelling of 21022100022 in words is "twenty-one billion, twenty-two million, one hundred thousand, twenty-two".