202001221001021 has 4 divisors (see below), whose sum is σ = 217539776462652. Its totient is φ = 186462665539392.

The previous prime is 202001221001017. The next prime is 202001221001051. The reversal of 202001221001021 is 120100122100202.

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 9075065875225 + 192926155125796 = 3012485^2 + 13889786^2 .

It is a cyclic number.

It is not a de Polignac number, because 202001221001021 - 2² = 202001221001017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202001221000987 and 202001221001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202001221001051) 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, 7769277730796 + ... + 7769277730821.

It is an arithmetic number, because the mean of its divisors is an integer number (54384944115663).

Almost surely, 2^{202001221001021} is an apocalyptic number.

It is an amenable number.

202001221001021 is a deficient number, since it is larger than the sum of its proper divisors (15538555461631).

202001221001021 is a wasteful number, since it uses less digits than its factorization.

202001221001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15538555461630.

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

Adding to 202001221001021 its reverse (120100122100202), we get a palindrome (322101343101223).

The spelling of 202001221001021 in words is "two hundred two trillion, one billion, two hundred twenty-one million, one thousand, twenty-one".