202210101220021 has 4 divisors (see below), whose sum is σ = 203498063648332. Its totient is φ = 200922138791712.

The previous prime is 202210101219983. The next prime is 202210101220031. The reversal of 202210101220021 is 120022101012202.

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 38321175968100 + 163888925251921 = 6190410^2 + 12801911^2 .

It is a cyclic number.

It is not a de Polignac number, because 202210101220021 - 2¹⁵ = 202210101187253 is a prime.

It is a super-2 number, since 2×202210101220021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202210101219977 and 202210101220004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202210101220031) 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, 643981213920 + ... + 643981214233.

It is an arithmetic number, because the mean of its divisors is an integer number (50874515912083).

Almost surely, 2^{202210101220021} is an apocalyptic number.

It is an amenable number.

202210101220021 is a deficient number, since it is larger than the sum of its proper divisors (1287962428311).

202210101220021 is a wasteful number, since it uses less digits than its factorization.

202210101220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287962428310.

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

Adding to 202210101220021 its reverse (120022101012202), we get a palindrome (322232202232223).

The spelling of 202210101220021 in words is "two hundred two trillion, two hundred ten billion, one hundred one million, two hundred twenty thousand, twenty-one".