201221961 has 8 divisors (see below), whose sum is σ = 276950784. Its totient is φ = 129820560.

The previous prime is 201221959. The next prime is 201222001. The reversal of 201221961 is 169122102.

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

It is not a de Polignac number, because 201221961 - 2¹ = 201221959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201221921) 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, 1081746 + ... + 1081931.

It is an arithmetic number, because the mean of its divisors is an integer number (34618848).

Almost surely, 2^201221961 is an apocalyptic number.

It is an amenable number.

201221961 is a deficient number, since it is larger than the sum of its proper divisors (75728823).

201221961 is a wasteful number, since it uses less digits than its factorization.

201221961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163711.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 201221961 is about 14185.2726797901. The cubic root of 201221961 is about 585.9921421056.

The spelling of 201221961 in words is "two hundred one million, two hundred twenty-one thousand, nine hundred sixty-one".