1621415129104 has 15 divisors (see below), whose sum is σ = 3141501681117. Its totient is φ = 810705017856.

The previous prime is 1621415129093. The next prime is 1621415129123. The reversal of 1621415129104 is 4019215141261.

The square root of 1621415129104 is 1273348.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 201618960400 + 1419796168704 = 449020^2 + 1191552^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4934224 + ... + 5252560.

Almost surely, 2^{1621415129104} is an apocalyptic number.

1621415129104 is the 1273348-th square number.

It is an amenable number.

1621415129104 is a deficient number, since it is larger than the sum of its proper divisors (1520086552013).

1621415129104 is an frugal number, since it uses more digits than its factorization.

1621415129104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636682 (or 318339 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 1621415129104 in words is "one trillion, six hundred twenty-one billion, four hundred fifteen million, one hundred twenty-nine thousand, one hundred four".