1621066138852 has 48 divisors (see below), whose sum is σ = 2932922732544. Its totient is φ = 783170388000.

The previous prime is 1621066138841. The next prime is 1621066138889. The reversal of 1621066138852 is 2588316601261.

It is a junction number, because it is equal to n+sod(n) for n = 1621066138796 and 1621066138805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349139643 + ... + 349144285.

It is an arithmetic number, because the mean of its divisors is an integer number (61102556928).

Almost surely, 2^{1621066138852} is an apocalyptic number.

It is an amenable number.

1621066138852 is a deficient number, since it is larger than the sum of its proper divisors (1311856593692).

1621066138852 is a wasteful number, since it uses less digits than its factorization.

1621066138852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8440 (or 8438 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 1621066138852 in words is "one trillion, six hundred twenty-one billion, sixty-six million, one hundred thirty-eight thousand, eight hundred fifty-two".