20202102212021 has 16 divisors (see below), whose sum is σ = 20442829587840. Its totient is φ = 19962818971200.

The previous prime is 20202102211981. The next prime is 20202102212053. The reversal of 20202102212021 is 12021220120202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20202102212021 - 2³⁰ = 20201028470197 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 (20202102212221) 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, 171849155 + ... + 171966671.

It is an arithmetic number, because the mean of its divisors is an integer number (1277676849240).

Almost surely, 2^{20202102212021} is an apocalyptic number.

It is an amenable number.

20202102212021 is a deficient number, since it is larger than the sum of its proper divisors (240727375819).

20202102212021 is a wasteful number, since it uses less digits than its factorization.

20202102212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123644.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20202102212021 its reverse (12021220120202), we get a palindrome (32223322332223).

The spelling of 20202102212021 in words is "twenty trillion, two hundred two billion, one hundred two million, two hundred twelve thousand, twenty-one".