21207990141 has 36 divisors (see below), whose sum is σ = 33139153684. Its totient is φ = 12992279040.

The previous prime is 21207990131. The next prime is 21207990143. The reversal of 21207990141 is 14109970212.

It can be written as a sum of positive squares in 6 ways, for example, as 19489556025 + 1718434116 = 139605^2 + 41454^2 .

It is not a de Polignac number, because 21207990141 - 2¹¹ = 21207988093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21207990096 and 21207990105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21207990143) 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 35 ways as a sum of consecutive naturals, for example, 27868201 + ... + 27868961.

Almost surely, 2^21207990141 is an apocalyptic number.

It is an amenable number.

21207990141 is a deficient number, since it is larger than the sum of its proper divisors (11931163543).

21207990141 is an equidigital number, since it uses as much as digits as its factorization.

21207990141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 21207990141 in words is "twenty-one billion, two hundred seven million, nine hundred ninety thousand, one hundred forty-one".