202102101221 has 4 divisors (see below), whose sum is σ = 202103401344. Its totient is φ = 202100801100.

The previous prime is 202102101211. The next prime is 202102101277. The reversal of 202102101221 is 122101201202.

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 202102101221 - 2¹⁴ = 202102084837 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 = 202102101196 and 202102101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202102101211) 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, 379295 + ... + 740316.

It is an arithmetic number, because the mean of its divisors is an integer number (50525850336).

Almost surely, 2^202102101221 is an apocalyptic number.

It is an amenable number.

202102101221 is a deficient number, since it is larger than the sum of its proper divisors (1300123).

202102101221 is a wasteful number, since it uses less digits than its factorization.

202102101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300122.

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

Adding to 202102101221 its reverse (122101201202), we get a palindrome (324203302423).

The spelling of 202102101221 in words is "two hundred two billion, one hundred two million, one hundred one thousand, two hundred twenty-one".