21023413215 has 16 divisors (see below), whose sum is σ = 38442812928. Its totient is φ = 9610703136.

The previous prime is 21023413211. The next prime is 21023413219. The reversal of 21023413215 is 51231432012.

It is an interprime number because it is at equal distance from previous prime (21023413211) and next prime (21023413219).

It is not a de Polignac number, because 21023413215 - 2² = 21023413211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023413211) 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, 100111387 + ... + 100111596.

It is an arithmetic number, because the mean of its divisors is an integer number (2402675808).

Almost surely, 2^21023413215 is an apocalyptic number.

21023413215 is a deficient number, since it is larger than the sum of its proper divisors (17419399713).

21023413215 is a wasteful number, since it uses less digits than its factorization.

21023413215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200222998.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21023413215 its reverse (51231432012), we get a palindrome (72254845227).

The spelling of 21023413215 in words is "twenty-one billion, twenty-three million, four hundred thirteen thousand, two hundred fifteen".