20102210022121 has 4 divisors (see below), whose sum is σ = 20102332405572. Its totient is φ = 20102087638672.

The previous prime is 20102210022107. The next prime is 20102210022137. The reversal of 20102210022121 is 12122001220102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9277287506496 + 10824922515625 = 3045864^2 + 3290125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102210022121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102210022095 and 20102210022104.

It is not an unprimeable number, because it can be changed into a prime (20102210052121) 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, 60945010 + ... + 61273963.

It is an arithmetic number, because the mean of its divisors is an integer number (5025583101393).

Almost surely, 2^{20102210022121} is an apocalyptic number.

It is an amenable number.

20102210022121 is a deficient number, since it is larger than the sum of its proper divisors (122383451).

20102210022121 is a wasteful number, since it uses less digits than its factorization.

20102210022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122383450.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20102210022121 its reverse (12122001220102), we get a palindrome (32224211242223).

The spelling of 20102210022121 in words is "twenty trillion, one hundred two billion, two hundred ten million, twenty-two thousand, one hundred twenty-one".