20996291121 has 24 divisors (see below), whose sum is σ = 30327761376. Its totient is φ = 12915002880.

The previous prime is 20996291111. The next prime is 20996291149. The reversal of 20996291121 is 12119269902.

It is not a de Polignac number, because 20996291121 - 2¹⁹ = 20995766833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20996291111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1306666 + ... + 1322636.

It is an arithmetic number, because the mean of its divisors is an integer number (1263656724).

Almost surely, 2^20996291121 is an apocalyptic number.

It is an amenable number.

20996291121 is a deficient number, since it is larger than the sum of its proper divisors (9331470255).

20996291121 is a wasteful number, since it uses less digits than its factorization.

20996291121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18593 (or 18580 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 42.

The spelling of 20996291121 in words is "twenty billion, nine hundred ninety-six million, two hundred ninety-one thousand, one hundred twenty-one".