20221200021 has 16 divisors (see below), whose sum is σ = 29544560640. Its totient is φ = 12200311920.

The previous prime is 20221200017. The next prime is 20221200031. The reversal of 20221200021 is 12000212202.

It is not a de Polignac number, because 20221200021 - 2² = 20221200017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221200031) 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, 1366551 + ... + 1381268.

It is an arithmetic number, because the mean of its divisors is an integer number (1846535040).

Almost surely, 2^20221200021 is an apocalyptic number.

It is an amenable number.

20221200021 is a deficient number, since it is larger than the sum of its proper divisors (9323360619).

20221200021 is a wasteful number, since it uses less digits than its factorization.

20221200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2748056.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20221200021 its reverse (12000212202), we get a palindrome (32221412223).

The spelling of 20221200021 in words is "twenty billion, two hundred twenty-one million, two hundred thousand, twenty-one".