22201000100021 has 4 divisors (see below), whose sum is σ = 22201154815500. Its totient is φ = 22200845384544.

The previous prime is 22201000099969. The next prime is 22201000100039. The reversal of 22201000100021 is 12000100010222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12899195487025 + 9301804612996 = 3591545^2 + 3049886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22201000100021 is a prime.

It is a super-2 number, since 2×22201000100021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22201000099975 and 22201000100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201000400021) 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, 77142296 + ... + 77429553.

It is an arithmetic number, because the mean of its divisors is an integer number (5550288703875).

Almost surely, 2^{22201000100021} is an apocalyptic number.

It is an amenable number.

22201000100021 is a deficient number, since it is larger than the sum of its proper divisors (154715479).

22201000100021 is a wasteful number, since it uses less digits than its factorization.

22201000100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154715478.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 22201000100021 its reverse (12000100010222), we get a palindrome (34201100110243).

The spelling of 22201000100021 in words is "twenty-two trillion, two hundred one billion, one hundred thousand, twenty-one".