21274742106 has 48 divisors (see below), whose sum is σ = 48980648808. Its totient is φ = 6650649600.

The previous prime is 21274742077. The next prime is 21274742117. The reversal of 21274742106 is 60124747212.

It can be written as a sum of positive squares in 4 ways, for example, as 17491385025 + 3783357081 = 132255^2 + 61509^2 .

It is a super-2 number, since 2×21274742106² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37725 + ... + 209696.

Almost surely, 2^21274742106 is an apocalyptic number.

21274742106 is an abundant number, since it is smaller than the sum of its proper divisors (27705906702).

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

21274742106 is a wasteful number, since it uses less digits than its factorization.

21274742106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247727 (or 247724 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The spelling of 21274742106 in words is "twenty-one billion, two hundred seventy-four million, seven hundred forty-two thousand, one hundred six".