20000137221 has 16 divisors (see below), whose sum is σ = 29634704320. Its totient is φ = 13331232720.

The previous prime is 20000137189. The next prime is 20000137277. The reversal of 20000137221 is 12273100002.

It is not a de Polignac number, because 20000137221 - 2⁵ = 20000137189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000137194 and 20000137203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000137021) 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, 115686 + ... + 231048.

It is an arithmetic number, because the mean of its divisors is an integer number (1852169020).

Almost surely, 2^20000137221 is an apocalyptic number.

It is an amenable number.

20000137221 is a deficient number, since it is larger than the sum of its proper divisors (9634567099).

20000137221 is a wasteful number, since it uses less digits than its factorization.

20000137221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121793 (or 121787 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

Adding to 20000137221 its reverse (12273100002), we get a palindrome (32273237223).

The spelling of 20000137221 in words is "twenty billion, one hundred thirty-seven thousand, two hundred twenty-one".