221021071398072 has 128 divisors (see below), whose sum is σ = 669765948307200. Its totient is φ = 66975569654400.

The previous prime is 221021071398037. The next prime is 221021071398077. The reversal of 221021071398072 is 270893170120122.

221021071398072 is a `hidden beast` number, since 2 + 210 + 210 + 71 + 3 + 98 + 0 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021071398077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409402543 + ... + 409942049.

It is an arithmetic number, because the mean of its divisors is an integer number (5232546471150).

Almost surely, 2^{221021071398072} is an apocalyptic number.

221021071398072 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221021071398072 is an abundant number, since it is smaller than the sum of its proper divisors (448744876909128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221021071398072 is a wasteful number, since it uses less digits than its factorization.

221021071398072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711954 (or 711944 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The spelling of 221021071398072 in words is "two hundred twenty-one trillion, twenty-one billion, seventy-one million, three hundred ninety-eight thousand, seventy-two".