2151532311621 has 128 divisors (see below), whose sum is σ = 3803820134400. Its totient is φ = 1047262003200.

The previous prime is 2151532311619. The next prime is 2151532311647. The reversal of 2151532311621 is 1261132351512.

It is not a de Polignac number, because 2151532311621 - 2¹ = 2151532311619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151532311601) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1006799265 + ... + 1006801401.

It is an arithmetic number, because the mean of its divisors is an integer number (29717344800).

Almost surely, 2^{2151532311621} is an apocalyptic number.

2151532311621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2151532311621 is a deficient number, since it is larger than the sum of its proper divisors (1652287822779).

2151532311621 is a wasteful number, since it uses less digits than its factorization.

2151532311621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195.

The product of its digits is 10800, while the sum is 33.

The spelling of 2151532311621 in words is "two trillion, one hundred fifty-one billion, five hundred thirty-two million, three hundred eleven thousand, six hundred twenty-one".