20022002021 has 32 divisors (see below), whose sum is σ = 24415838208. Its totient is φ = 16046110080.

The previous prime is 20022002009. The next prime is 20022002041. The reversal of 20022002021 is 12020022002.

It is a de Polignac number, because none of the positive numbers 2^k-20022002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20022001993 and 20022002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022002041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9995006 + ... + 9997008.

It is an arithmetic number, because the mean of its divisors is an integer number (762994944).

Almost surely, 2^20022002021 is an apocalyptic number.

It is an amenable number.

20022002021 is a deficient number, since it is larger than the sum of its proper divisors (4393836187).

20022002021 is a wasteful number, since it uses less digits than its factorization.

20022002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 20022002021 its reverse (12020022002), we get a palindrome (32042024023).

The spelling of 20022002021 in words is "twenty billion, twenty-two million, two thousand, twenty-one".