202101121000021 has 4 divisors (see below), whose sum is σ = 202101189961600. Its totient is φ = 202101052038444.

The previous prime is 202101121000013. The next prime is 202101121000061. The reversal of 202101121000021 is 120000121101202.

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 202101121000021 - 2³ = 202101121000013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202101120999965 and 202101121000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101121000001) 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, 29880231 + ... + 36014308.

It is an arithmetic number, because the mean of its divisors is an integer number (50525297490400).

Almost surely, 2^{202101121000021} is an apocalyptic number.

It is an amenable number.

202101121000021 is a deficient number, since it is larger than the sum of its proper divisors (68961579).

202101121000021 is an equidigital number, since it uses as much as digits as its factorization.

202101121000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68961578.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 202101121000021 its reverse (120000121101202), we get a palindrome (322101242101223).

The spelling of 202101121000021 in words is "two hundred two trillion, one hundred one billion, one hundred twenty-one million, twenty-one", and thus it is an aban number.