221421402357357 has 4 divisors (see below), whose sum is σ = 295228536476480. Its totient is φ = 147614268238236.

The previous prime is 221421402357317. The next prime is 221421402357391. The reversal of 221421402357357 is 753753204124122.

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 not a de Polignac number, because 221421402357357 - 2⁶ = 221421402357293 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 (221421402357317) 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, 36903567059557 + ... + 36903567059562.

It is an arithmetic number, because the mean of its divisors is an integer number (73807134119120).

Almost surely, 2^{221421402357357} is an apocalyptic number.

It is an amenable number.

221421402357357 is a deficient number, since it is larger than the sum of its proper divisors (73807134119123).

221421402357357 is an equidigital number, since it uses as much as digits as its factorization.

221421402357357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73807134119122.

The product of its (nonzero) digits is 2822400, while the sum is 48.

The spelling of 221421402357357 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, four hundred two million, three hundred fifty-seven thousand, three hundred fifty-seven".