21122103015 has 48 divisors (see below), whose sum is σ = 41142209472. Its totient is φ = 9946455552.

The previous prime is 21122103007. The next prime is 21122103017. The reversal of 21122103015 is 51030122112.

It is not a de Polignac number, because 21122103015 - 2³ = 21122103007 is a prime.

It is a super-2 number, since 2×21122103015² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122103017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 771462 + ... + 798371.

It is an arithmetic number, because the mean of its divisors is an integer number (857129364).

Almost surely, 2^21122103015 is an apocalyptic number.

21122103015 is a deficient number, since it is larger than the sum of its proper divisors (20020106457).

21122103015 is a wasteful number, since it uses less digits than its factorization.

21122103015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569880 (or 1569877 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 21122103015 its reverse (51030122112), we get a palindrome (72152225127).

The spelling of 21122103015 in words is "twenty-one billion, one hundred twenty-two million, one hundred three thousand, fifteen".