221324224004021 has 4 divisors (see below), whose sum is σ = 221351113117344. Its totient is φ = 221297334890700.

The previous prime is 221324224003973. The next prime is 221324224004119. The reversal of 221324224004021 is 120400422423122.

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 221324224004021 - 2⁶ = 221324224003957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221324224004321) 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, 13444544315 + ... + 13444560776.

It is an arithmetic number, because the mean of its divisors is an integer number (55337778279336).

Almost surely, 2^{221324224004021} is an apocalyptic number.

It is an amenable number.

221324224004021 is a deficient number, since it is larger than the sum of its proper divisors (26889113323).

221324224004021 is an equidigital number, since it uses as much as digits as its factorization.

221324224004021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26889113322.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 221324224004021 its reverse (120400422423122), we get a palindrome (341724646427143).

The spelling of 221324224004021 in words is "two hundred twenty-one trillion, three hundred twenty-four billion, two hundred twenty-four million, four thousand, twenty-one".