22102100012021 has 4 divisors (see below), whose sum is σ = 22102109675052. Its totient is φ = 22102090348992.

The previous prime is 22102100011997. The next prime is 22102100012063. The reversal of 22102100012021 is 12021000120122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9181051500625 + 12921048511396 = 3030025^2 + 3594586^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102100012021 - 2²⁶ = 22102032903157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22102100011987 and 22102100012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102100012081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744461 + ... + 6690173.

It is an arithmetic number, because the mean of its divisors is an integer number (5525527418763).

Almost surely, 2^{22102100012021} is an apocalyptic number.

It is an amenable number.

22102100012021 is a deficient number, since it is larger than the sum of its proper divisors (9663031).

22102100012021 is an equidigital number, since it uses as much as digits as its factorization.

22102100012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9663030.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22102100012021 its reverse (12021000120122), we get a palindrome (34123100132143).

The spelling of 22102100012021 in words is "twenty-two trillion, one hundred two billion, one hundred million, twelve thousand, twenty-one".