202101220121 has 4 divisors (see below), whose sum is σ = 202815358992. Its totient is φ = 201387081252.

The previous prime is 202101220117. The next prime is 202101220129. The reversal of 202101220121 is 121022101202.

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 202101220121 - 2² = 202101220117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202101220096 and 202101220105.

It is not an unprimeable number, because it can be changed into a prime (202101220129) 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, 357069011 + ... + 357069576.

It is an arithmetic number, because the mean of its divisors is an integer number (50703839748).

Almost surely, 2^202101220121 is an apocalyptic number.

It is an amenable number.

202101220121 is a deficient number, since it is larger than the sum of its proper divisors (714138871).

202101220121 is an equidigital number, since it uses as much as digits as its factorization.

202101220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714138870.

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

Adding to 202101220121 its reverse (121022101202), we get a palindrome (323123321323).

The spelling of 202101220121 in words is "two hundred two billion, one hundred one million, two hundred twenty thousand, one hundred twenty-one".