22101202222021 has 24 divisors (see below), whose sum is σ = 24764349645000. Its totient is φ = 19692026145792.

The previous prime is 22101202222009. The next prime is 22101202222037. The reversal of 22101202222021 is 12022220210122.

It can be written as a sum of positive squares in 12 ways, for example, as 16016524264225 + 6084677957796 = 4002065^2 + 2466714^2 .

It is not a de Polignac number, because 22101202222021 - 2²⁹ = 22100665351109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22101202222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101202222051) 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, 16656705 + ... + 17934553.

It is an arithmetic number, because the mean of its divisors is an integer number (1031847901875).

Almost surely, 2^{22101202222021} is an apocalyptic number.

It is an amenable number.

22101202222021 is a deficient number, since it is larger than the sum of its proper divisors (2663147422979).

22101202222021 is a wasteful number, since it uses less digits than its factorization.

22101202222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281433 (or 1281420 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 22101202222021 its reverse (12022220210122), we get a palindrome (34123422432143).

The spelling of 22101202222021 in words is "twenty-two trillion, one hundred one billion, two hundred two million, two hundred twenty-two thousand, twenty-one".