7221137050021 has 4 divisors (see below), whose sum is σ = 7248593845152. Its totient is φ = 7193680254892.

The previous prime is 7221137050013. The next prime is 7221137050031. The reversal of 7221137050021 is 1200507311227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7221137050021 - 2³ = 7221137050013 is a prime.

It is a super-2 number, since 2×7221137050021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221137050031) 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, 13728397171 + ... + 13728397696.

It is an arithmetic number, because the mean of its divisors is an integer number (1812148461288).

Almost surely, 2^{7221137050021} is an apocalyptic number.

It is an amenable number.

7221137050021 is a deficient number, since it is larger than the sum of its proper divisors (27456795131).

7221137050021 is a wasteful number, since it uses less digits than its factorization.

7221137050021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27456795130.

The product of its (nonzero) digits is 5880, while the sum is 31.

The spelling of 7221137050021 in words is "seven trillion, two hundred twenty-one billion, one hundred thirty-seven million, fifty thousand, twenty-one".