21023124213 has 32 divisors (see below), whose sum is σ = 35150443776. Its totient is φ = 10879884288.

The previous prime is 21023124173. The next prime is 21023124223. The reversal of 21023124213 is 31242132012.

It is not a de Polignac number, because 21023124213 - 2¹² = 21023120117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21023124213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023124223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 712020 + ... + 740957.

It is an arithmetic number, because the mean of its divisors is an integer number (1098451368).

Almost surely, 2^21023124213 is an apocalyptic number.

It is an amenable number.

21023124213 is a deficient number, since it is larger than the sum of its proper divisors (14127319563).

21023124213 is a wasteful number, since it uses less digits than its factorization.

21023124213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453053.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21023124213 its reverse (31242132012), we get a palindrome (52265256225).

The spelling of 21023124213 in words is "twenty-one billion, twenty-three million, one hundred twenty-four thousand, two hundred thirteen".