202122002021 has 4 divisors (see below), whose sum is σ = 202123670112. Its totient is φ = 202120333932.

The previous prime is 202122002009. The next prime is 202122002057. The reversal of 202122002021 is 120200221202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202122002021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202122001987 and 202122002005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122001021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636731 + ... + 899816.

It is an arithmetic number, because the mean of its divisors is an integer number (50530917528).

Almost surely, 2^202122002021 is an apocalyptic number.

It is an amenable number.

202122002021 is a deficient number, since it is larger than the sum of its proper divisors (1668091).

202122002021 is a wasteful number, since it uses less digits than its factorization.

202122002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668090.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 202122002021 its reverse (120200221202), we get a palindrome (322322223223).

The spelling of 202122002021 in words is "two hundred two billion, one hundred twenty-two million, two thousand, twenty-one".