221421255265077 has 16 divisors (see below), whose sum is σ = 337453023514752. Its totient is φ = 126507979342080.

The previous prime is 221421255265069. The next prime is 221421255265079. The reversal of 221421255265077 is 770562552124122.

It is not a de Polignac number, because 221421255265077 - 2³ = 221421255265069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421255265079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 768695824 + ... + 768983817.

It is an arithmetic number, because the mean of its divisors is an integer number (21090813969672).

Almost surely, 2^{221421255265077} is an apocalyptic number.

It is an amenable number.

221421255265077 is a deficient number, since it is larger than the sum of its proper divisors (116031768249675).

221421255265077 is a wasteful number, since it uses less digits than its factorization.

221421255265077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537686508.

The product of its (nonzero) digits is 4704000, while the sum is 51.

The spelling of 221421255265077 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, two hundred sixty-five thousand, seventy-seven".