505212120621 has 16 divisors (see below), whose sum is σ = 806036432320. Its totient is φ = 310899766320.

The previous prime is 505212120599. The next prime is 505212120659. The reversal of 505212120621 is 126021212505.

505212120621 is a `hidden beast` number, since 5 + 0 + 5 + 2 + 12 + 1 + 20 + 621 = 666.

It is not a de Polignac number, because 505212120621 - 2¹⁰ = 505212119597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505212120691) 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, 719675035 + ... + 719675736.

It is an arithmetic number, because the mean of its divisors is an integer number (50377277020).

Almost surely, 2^505212120621 is an apocalyptic number.

It is an amenable number.

505212120621 is a deficient number, since it is larger than the sum of its proper divisors (300824311699).

505212120621 is a wasteful number, since it uses less digits than its factorization.

505212120621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439350793 (or 1439350787 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 505212120621 in words is "five hundred five billion, two hundred twelve million, one hundred twenty thousand, six hundred twenty-one".