221421255265076 has 12 divisors (see below), whose sum is σ = 387489006898308. Its totient is φ = 110710110436992.

The previous prime is 221421255265069. The next prime is 221421255265079. The reversal of 221421255265076 is 670562552124122.

It can be written as a sum of positive squares in 2 ways, for example, as 138956331024676 + 82464924240400 = 11787974^2 + 9081020^2 .

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 3 ways as a sum of consecutive naturals, for example, 128334821 + ... + 130048716.

It is an arithmetic number, because the mean of its divisors is an integer number (32290750574859).

Almost surely, 2^{221421255265076} is an apocalyptic number.

It is an amenable number.

221421255265076 is a deficient number, since it is larger than the sum of its proper divisors (166067751633232).

221421255265076 is a wasteful number, since it uses less digits than its factorization.

221421255265076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258597778 (or 258597776 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 50.

The spelling of 221421255265076 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, two hundred sixty-five thousand, seventy-six".