20021002212021 has 4 divisors (see below), whose sum is σ = 26694669616032. Its totient is φ = 13347334808012.

The previous prime is 20021002212019. The next prime is 20021002212047. The reversal of 20021002212021 is 12021220012002.

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 not a de Polignac number, because 20021002212021 - 2¹ = 20021002212019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021002214021) 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, 3336833702001 + ... + 3336833702006.

It is an arithmetic number, because the mean of its divisors is an integer number (6673667404008).

Almost surely, 2^{20021002212021} is an apocalyptic number.

It is an amenable number.

20021002212021 is a deficient number, since it is larger than the sum of its proper divisors (6673667404011).

20021002212021 is an equidigital number, since it uses as much as digits as its factorization.

20021002212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6673667404010.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20021002212021 its reverse (12021220012002), we get a palindrome (32042222224023).

The spelling of 20021002212021 in words is "twenty trillion, twenty-one billion, two million, two hundred twelve thousand, twenty-one".