221421255544744 has 8 divisors (see below), whose sum is σ = 415164854146410. Its totient is φ = 110710627772368.

The previous prime is 221421255544717. The next prime is 221421255544787. The reversal of 221421255544744 is 447445552124122.

It can be written as a sum of positive squares in only one way, i.e., 146953503063844 + 74467752480900 = 12122438^2 + 8629470^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 221421255544691 and 221421255544700.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13838828471539 + ... + 13838828471554.

Almost surely, 2^{221421255544744} is an apocalyptic number.

It is an amenable number.

221421255544744 is a deficient number, since it is larger than the sum of its proper divisors (193743598601666).

221421255544744 is a wasteful number, since it uses less digits than its factorization.

221421255544744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27677656943099 (or 27677656943095 counting only the distinct ones).

The product of its digits is 14336000, while the sum is 52.

The spelling of 221421255544744 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-four thousand, seven hundred forty-four".