21101220022 has 16 divisors (see below), whose sum is σ = 32159350944. Its totient is φ = 10382008000.

The previous prime is 21101220017. The next prime is 21101220043. The reversal of 21101220022 is 22002210112.

It is a happy number.

It is a super-2 number, since 2×21101220022² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21101219984 and 21101220011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68629 + ... + 216592.

It is an arithmetic number, because the mean of its divisors is an integer number (2009959434).

Almost surely, 2^21101220022 is an apocalyptic number.

21101220022 is a deficient number, since it is larger than the sum of its proper divisors (11058130922).

21101220022 is a wasteful number, since it uses less digits than its factorization.

21101220022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285815.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21101220022 its reverse (22002210112), we get a palindrome (43103430134).

The spelling of 21101220022 in words is "twenty-one billion, one hundred one million, two hundred twenty thousand, twenty-two".