21092102740 has 24 divisors (see below), whose sum is σ = 44299988712. Its totient is φ = 8435589120.

The previous prime is 21092102719. The next prime is 21092102743. The reversal of 21092102740 is 4720129012.

It can be written as a sum of positive squares in 4 ways, for example, as 13157925264 + 7934177476 = 114708^2 + 89074^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21092102699 and 21092102708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21092102743) 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, 66420 + ... + 215860.

It is an arithmetic number, because the mean of its divisors is an integer number (1845832863).

Almost surely, 2^21092102740 is an apocalyptic number.

21092102740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21092102740 is an abundant number, since it is smaller than the sum of its proper divisors (23207885972).

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

21092102740 is a wasteful number, since it uses less digits than its factorization.

21092102740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156507 (or 156505 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The spelling of 21092102740 in words is "twenty-one billion, ninety-two million, one hundred two thousand, seven hundred forty".