20199437121 has 16 divisors (see below), whose sum is σ = 27781313600. Its totient is φ = 13045105728.

The previous prime is 20199437113. The next prime is 20199437143. The reversal of 20199437121 is 12173499102.

It is not a de Polignac number, because 20199437121 - 2³ = 20199437113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20199437121.

It is not an unprimeable number, because it can be changed into a prime (20199437161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371911 + ... + 422748.

It is an arithmetic number, because the mean of its divisors is an integer number (1736332100).

Almost surely, 2^20199437121 is an apocalyptic number.

It is an amenable number.

20199437121 is a deficient number, since it is larger than the sum of its proper divisors (7581876479).

20199437121 is a wasteful number, since it uses less digits than its factorization.

20199437121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794928.

The product of its (nonzero) digits is 27216, while the sum is 39.

The spelling of 20199437121 in words is "twenty billion, one hundred ninety-nine million, four hundred thirty-seven thousand, one hundred twenty-one".