221951433 has 16 divisors (see below), whose sum is σ = 323116992. Its totient is φ = 134400000.

The previous prime is 221951399. The next prime is 221951441. The reversal of 221951433 is 334159122.

It is not a de Polignac number, because 221951433 - 2⁹ = 221950921 is a prime.

It is a super-2 number, since 2×221951433² = 98524877221506978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221951433.

It is not an unprimeable number, because it can be changed into a prime (221958433) 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, 50733 + ... + 54933.

It is an arithmetic number, because the mean of its divisors is an integer number (20194812).

Almost surely, 2^221951433 is an apocalyptic number.

It is an amenable number.

221951433 is a deficient number, since it is larger than the sum of its proper divisors (101165559).

221951433 is a wasteful number, since it uses less digits than its factorization.

221951433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816.

The product of its digits is 6480, while the sum is 30.

The square root of 221951433 is about 14898.0345347969. The cubic root of 221951433 is about 605.4607359409.

The spelling of 221951433 in words is "two hundred twenty-one million, nine hundred fifty-one thousand, four hundred thirty-three".