202020210100021 has 8 divisors (see below), whose sum is σ = 203981953358144. Its totient is φ = 200058474188160.

The previous prime is 202020210099931. The next prime is 202020210100057. The reversal of 202020210100021 is 120001012020202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 202020210100021 - 2¹⁵ = 202020210067253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202020210099974 and 202020210100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202020210107021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65281270 + ... + 68305816.

It is an arithmetic number, because the mean of its divisors is an integer number (25497744169768).

Almost surely, 2^{202020210100021} is an apocalyptic number.

It is an amenable number.

202020210100021 is a deficient number, since it is larger than the sum of its proper divisors (1961743258123).

202020210100021 is a wasteful number, since it uses less digits than its factorization.

202020210100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3673131.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 202020210100021 its reverse (120001012020202), we get a palindrome (322021222120223).

The spelling of 202020210100021 in words is "two hundred two trillion, twenty billion, two hundred ten million, one hundred thousand, twenty-one".