1621062221172 has 48 divisors (see below), whose sum is σ = 3791733009792. Its totient is φ = 539033443200.

The previous prime is 1621062221167. The next prime is 1621062221173. The reversal of 1621062221172 is 2711222601261.

It is a super-2 number, since 2×1621062221172² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621062221173) 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, 9010297 + ... + 9188447.

It is an arithmetic number, because the mean of its divisors is an integer number (78994437704).

Almost surely, 2^{1621062221172} is an apocalyptic number.

1621062221172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621062221172 is an abundant number, since it is smaller than the sum of its proper divisors (2170670788620).

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

1621062221172 is a wasteful number, since it uses less digits than its factorization.

1621062221172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180008 (or 180006 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 1621062221172 in words is "one trillion, six hundred twenty-one billion, sixty-two million, two hundred twenty-one thousand, one hundred seventy-two".