1621035711072 has 72 divisors (see below), whose sum is σ = 4622661323280. Its totient is φ = 538840062720.

The previous prime is 1621035711049. The next prime is 1621035711137. The reversal of 1621035711072 is 2701175301261.

1621035711072 is a `hidden beast` number, since 1 + 6 + 2 + 1 + 0 + 3 + 571 + 10 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7735879 + ... + 7942662.

It is an arithmetic number, because the mean of its divisors is an integer number (64203629490).

Almost surely, 2^{1621035711072} is an apocalyptic number.

1621035711072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621035711072 is an abundant number, since it is smaller than the sum of its proper divisors (3001625612208).

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

1621035711072 is a wasteful number, since it uses less digits than its factorization.

1621035711072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15678916 (or 15678905 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The spelling of 1621035711072 in words is "one trillion, six hundred twenty-one billion, thirty-five million, seven hundred eleven thousand, seventy-two".