221354051 has 4 divisors (see below), whose sum is σ = 222969912. Its totient is φ = 219738192.

The previous prime is 221354041. The next prime is 221354053. The reversal of 221354051 is 150453122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221354051 - 2¹⁴ = 221337667 is a prime.

It is a super-2 number, since 2×221354051² = 97995231788221202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221354053) 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, 807725 + ... + 807998.

It is an arithmetic number, because the mean of its divisors is an integer number (55742478).

Almost surely, 2^221354051 is an apocalyptic number.

221354051 is a deficient number, since it is larger than the sum of its proper divisors (1615861).

221354051 is a wasteful number, since it uses less digits than its factorization.

221354051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615860.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 221354051 is about 14877.9720056196. The cubic root of 221354051 is about 604.9170489373.

The spelling of 221354051 in words is "two hundred twenty-one million, three hundred fifty-four thousand, fifty-one".