22221055400521 has 4 divisors (see below), whose sum is σ = 23528176306452. Its totient is φ = 20913934494592.

The previous prime is 22221055400513. The next prime is 22221055400543. The reversal of 22221055400521 is 12500455012222.

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 19944834449296 + 2276220951225 = 4465964^2 + 1508715^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221055400521 - 2³ = 22221055400513 is a prime.

It is a super-2 number, since 2×22221055400521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22221055200521) 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, 653560452940 + ... + 653560452973.

It is an arithmetic number, because the mean of its divisors is an integer number (5882044076613).

Almost surely, 2^{22221055400521} is an apocalyptic number.

It is an amenable number.

22221055400521 is a deficient number, since it is larger than the sum of its proper divisors (1307120905931).

22221055400521 is a wasteful number, since it uses less digits than its factorization.

22221055400521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307120905930.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 22221055400521 in words is "twenty-two trillion, two hundred twenty-one billion, fifty-five million, four hundred thousand, five hundred twenty-one".