20220010021 has 4 divisors (see below), whose sum is σ = 20221148844. Its totient is φ = 20218871200.

The previous prime is 20220010003. The next prime is 20220010043. The reversal of 20220010021 is 12001002202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2367309025 + 17852700996 = 48655^2 + 133614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20220010021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20220010051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542350 + ... + 578431.

It is an arithmetic number, because the mean of its divisors is an integer number (5055287211).

Almost surely, 2^20220010021 is an apocalyptic number.

It is an amenable number.

20220010021 is a deficient number, since it is larger than the sum of its proper divisors (1138823).

20220010021 is a wasteful number, since it uses less digits than its factorization.

20220010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138822.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20220010021 its reverse (12001002202), we get a palindrome (32221012223).

The spelling of 20220010021 in words is "twenty billion, two hundred twenty million, ten thousand, twenty-one".