10202121200021 has 4 divisors (see below), whose sum is σ = 10297468127232. Its totient is φ = 10106774272812.

The previous prime is 10202121199987. The next prime is 10202121200027. The reversal of 10202121200021 is 12000212120201.

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 10202121200021 - 2³⁰ = 10201047458197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10202121199969 and 10202121200005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202121200027) 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, 47673463445 + ... + 47673463658.

It is an arithmetic number, because the mean of its divisors is an integer number (2574367031808).

Almost surely, 2^{10202121200021} is an apocalyptic number.

It is an amenable number.

10202121200021 is a deficient number, since it is larger than the sum of its proper divisors (95346927211).

10202121200021 is an equidigital number, since it uses as much as digits as its factorization.

10202121200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95346927210.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10202121200021 its reverse (12000212120201), we get a palindrome (22202333320222).

The spelling of 10202121200021 in words is "ten trillion, two hundred two billion, one hundred twenty-one million, two hundred thousand, twenty-one".