1621531311452 has 12 divisors (see below), whose sum is σ = 3055962856296. Its totient is φ = 748399066800.

The previous prime is 1621531311451. The next prime is 1621531311469. The reversal of 1621531311452 is 2541131351261.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621531311451) 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, 15591647174 + ... + 15591647277.

It is an arithmetic number, because the mean of its divisors is an integer number (254663571358).

Almost surely, 2^{1621531311452} is an apocalyptic number.

It is an amenable number.

1621531311452 is a deficient number, since it is larger than the sum of its proper divisors (1434431544844).

1621531311452 is a wasteful number, since it uses less digits than its factorization.

1621531311452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31183294468 (or 31183294466 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The spelling of 1621531311452 in words is "one trillion, six hundred twenty-one billion, five hundred thirty-one million, three hundred eleven thousand, four hundred fifty-two".