202221991 has 8 divisors (see below), whose sum is σ = 207115920. Its totient is φ = 197336832.

The previous prime is 202221989. The next prime is 202222019. The reversal of 202221991 is 199122202.

202221991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 202221991 - 2¹ = 202221989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87831 + ... + 90103.

It is an arithmetic number, because the mean of its divisors is an integer number (25889490).

Almost surely, 2^202221991 is an apocalyptic number.

202221991 is a deficient number, since it is larger than the sum of its proper divisors (4893929).

202221991 is a wasteful number, since it uses less digits than its factorization.

202221991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 202221991 is about 14220.4778752333. The cubic root of 202221991 is about 586.9612901541.

The spelling of 202221991 in words is "two hundred two million, two hundred twenty-one thousand, nine hundred ninety-one".