21023442215 has 16 divisors (see below), whose sum is σ = 26328900096. Its totient is φ = 16085124000.

The previous prime is 21023442191. The next prime is 21023442227. The reversal of 21023442215 is 51224432012.

It is not a de Polignac number, because 21023442215 - 2²⁸ = 20755006759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1540070 + ... + 1553660.

It is an arithmetic number, because the mean of its divisors is an integer number (1645556256).

Almost surely, 2^21023442215 is an apocalyptic number.

21023442215 is a deficient number, since it is larger than the sum of its proper divisors (5305457881).

21023442215 is a wasteful number, since it uses less digits than its factorization.

21023442215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27070.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21023442215 its reverse (51224432012), we get a palindrome (72247874227).

The spelling of 21023442215 in words is "twenty-one billion, twenty-three million, four hundred forty-two thousand, two hundred fifteen".