505212112021 has 16 divisors (see below), whose sum is σ = 533511097600. Its totient is φ = 477084722688.

The previous prime is 505212112007. The next prime is 505212112043. The reversal of 505212112021 is 120211212505.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 505212112021 - 2²⁵ = 505178557589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505212111983 and 505212112001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505212112001) 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, 37380361 + ... + 37393873.

It is an arithmetic number, because the mean of its divisors is an integer number (33344443600).

Almost surely, 2^505212112021 is an apocalyptic number.

It is an amenable number.

505212112021 is a deficient number, since it is larger than the sum of its proper divisors (28298985579).

505212112021 is a wasteful number, since it uses less digits than its factorization.

505212112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19708.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 505212112021 its reverse (120211212505), we get a palindrome (625423324526).

The spelling of 505212112021 in words is "five hundred five billion, two hundred twelve million, one hundred twelve thousand, twenty-one".