221292086451 has 4 divisors (see below), whose sum is σ = 295056115272. Its totient is φ = 147528057632.

The previous prime is 221292086441. The next prime is 221292086453. The reversal of 221292086451 is 154680292122.

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

It is a cyclic number.

It is not a de Polignac number, because 221292086451 - 2⁵ = 221292086419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221292086453) 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, 36882014406 + ... + 36882014411.

It is an arithmetic number, because the mean of its divisors is an integer number (73764028818).

Almost surely, 2^221292086451 is an apocalyptic number.

221292086451 is a deficient number, since it is larger than the sum of its proper divisors (73764028821).

221292086451 is an equidigital number, since it uses as much as digits as its factorization.

221292086451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73764028820.

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 221292086451 in words is "two hundred twenty-one billion, two hundred ninety-two million, eighty-six thousand, four hundred fifty-one".