1621031217253 has 16 divisors (see below), whose sum is σ = 1991604510720. Its totient is φ = 1288319157936.

The previous prime is 1621031217227. The next prime is 1621031217293. The reversal of 1621031217253 is 3527121301261.

It is a cyclic number.

It is not a de Polignac number, because 1621031217253 - 2⁹ = 1621031216741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621031217293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129655501 + ... + 129668002.

It is an arithmetic number, because the mean of its divisors is an integer number (124475281920).

Almost surely, 2^{1621031217253} is an apocalyptic number.

It is an amenable number.

1621031217253 is a deficient number, since it is larger than the sum of its proper divisors (370573293467).

1621031217253 is a wasteful number, since it uses less digits than its factorization.

1621031217253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259323576.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 1621031217253 in words is "one trillion, six hundred twenty-one billion, thirty-one million, two hundred seventeen thousand, two hundred fifty-three".