221442211251 has 12 divisors (see below), whose sum is σ = 330890660880. Its totient is φ = 142537515120.

The previous prime is 221442211231. The next prime is 221442211337. The reversal of 221442211251 is 152112244122.

221442211251 is a `hidden beast` number, since 2 + 2 + 1 + 442 + 211 + 2 + 5 + 1 = 666.

It is not a de Polignac number, because 221442211251 - 2⁵ = 221442211219 is a prime.

It is a super-3 number, since 3×221442211251³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221442211231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 424218535 + ... + 424219056.

It is an arithmetic number, because the mean of its divisors is an integer number (27574221740).

Almost surely, 2^221442211251 is an apocalyptic number.

221442211251 is a deficient number, since it is larger than the sum of its proper divisors (109448449629).

221442211251 is a wasteful number, since it uses less digits than its factorization.

221442211251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848437626 (or 848437623 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

Adding to 221442211251 its reverse (152112244122), we get a palindrome (373554455373).

The spelling of 221442211251 in words is "two hundred twenty-one billion, four hundred forty-two million, two hundred eleven thousand, two hundred fifty-one".