202011021221 has 16 divisors (see below), whose sum is σ = 207029945088. Its totient is φ = 197055264000.

The previous prime is 202011021127. The next prime is 202011021257. The reversal of 202011021221 is 122120110202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202011021221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202011021196 and 202011021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202011021281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11055725 + ... + 11073981.

It is an arithmetic number, because the mean of its divisors is an integer number (12939371568).

Almost surely, 2^202011021221 is an apocalyptic number.

It is an amenable number.

202011021221 is a deficient number, since it is larger than the sum of its proper divisors (5018923867).

202011021221 is a wasteful number, since it uses less digits than its factorization.

202011021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19972.

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

Adding to 202011021221 its reverse (122120110202), we get a palindrome (324131131423).

The spelling of 202011021221 in words is "two hundred two billion, eleven million, twenty-one thousand, two hundred twenty-one".