202101001221 has 32 divisors (see below), whose sum is σ = 314352102400. Its totient is φ = 115448176368.

The previous prime is 202101001217. The next prime is 202101001231. The reversal of 202101001221 is 122100101202.

It is not a de Polignac number, because 202101001221 - 2² = 202101001217 is a prime.

It is a super-3 number, since 3×202101001221³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 202101001197 and 202101001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101001231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3248610 + ... + 3310236.

It is an arithmetic number, because the mean of its divisors is an integer number (9823503200).

Almost surely, 2^202101001221 is an apocalyptic number.

202101001221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202101001221 is a deficient number, since it is larger than the sum of its proper divisors (112251101179).

202101001221 is an equidigital number, since it uses as much as digits as its factorization.

202101001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64838 (or 64824 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 202101001221 its reverse (122100101202), we get a palindrome (324201102423).

The spelling of 202101001221 in words is "two hundred two billion, one hundred one million, one thousand, two hundred twenty-one".