21316122510 has 16 divisors (see below), whose sum is σ = 51158694096. Its totient is φ = 5684299328.

The previous prime is 21316122473. The next prime is 21316122521. The reversal of 21316122510 is 1522161312.

It is a happy number.

It is a super-2 number, since 2×21316122510² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 355268679 + ... + 355268738.

It is an arithmetic number, because the mean of its divisors is an integer number (3197418381).

Almost surely, 2^21316122510 is an apocalyptic number.

21316122510 is an abundant number, since it is smaller than the sum of its proper divisors (29842571586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21316122510 is a wasteful number, since it uses less digits than its factorization.

21316122510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710537427.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 21316122510 its reverse (1522161312), we get a palindrome (22838283822).

The spelling of 21316122510 in words is "twenty-one billion, three hundred sixteen million, one hundred twenty-two thousand, five hundred ten".