21107371506 has 16 divisors (see below), whose sum is σ = 45462031104. Its totient is φ = 6494575824.

The previous prime is 21107371489. The next prime is 21107371507. The reversal of 21107371506 is 60517370112.

It is a super-2 number, since 2×21107371506² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21107371507) 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 7 ways as a sum of consecutive naturals, for example, 135303586 + ... + 135303741.

It is an arithmetic number, because the mean of its divisors is an integer number (2841376944).

Almost surely, 2^21107371506 is an apocalyptic number.

21107371506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21107371506 is an abundant number, since it is smaller than the sum of its proper divisors (24354659598).

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

21107371506 is a wasteful number, since it uses less digits than its factorization.

21107371506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270607345.

The product of its (nonzero) digits is 8820, while the sum is 33.

The spelling of 21107371506 in words is "twenty-one billion, one hundred seven million, three hundred seventy-one thousand, five hundred six".