202121010105 has 16 divisors (see below), whose sum is σ = 369592704384. Its totient is φ = 92398176000.

The previous prime is 202121010061. The next prime is 202121010127. The reversal of 202121010105 is 501010121202.

It is not a de Polignac number, because 202121010105 - 2¹⁴ = 202120993721 is a prime.

It is a super-2 number, since 2×202121010105² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 962480896 + ... + 962481105.

It is an arithmetic number, because the mean of its divisors is an integer number (23099544024).

Almost surely, 2^202121010105 is an apocalyptic number.

It is an amenable number.

202121010105 is a deficient number, since it is larger than the sum of its proper divisors (167471694279).

202121010105 is a wasteful number, since it uses less digits than its factorization.

202121010105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924962016.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 202121010105 its reverse (501010121202), we get a palindrome (703131131307).

The spelling of 202121010105 in words is "two hundred two billion, one hundred twenty-one million, ten thousand, one hundred five".