222106021551 has 12 divisors (see below), whose sum is σ = 327645762912. Its totient is φ = 144920240736.

The previous prime is 222106021531. The next prime is 222106021567. The reversal of 222106021551 is 155120601222.

222106021551 is a `hidden beast` number, since 2 + 2 + 2 + 1 + 0 + 602 + 1 + 5 + 51 = 666.

It is not a de Polignac number, because 222106021551 - 2⁵ = 222106021519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222106021531) 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, 262536246 + ... + 262537091.

It is an arithmetic number, because the mean of its divisors is an integer number (27303813576).

Almost surely, 2^222106021551 is an apocalyptic number.

222106021551 is a deficient number, since it is larger than the sum of its proper divisors (105539741361).

222106021551 is a wasteful number, since it uses less digits than its factorization.

222106021551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525073390 (or 525073387 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 222106021551 its reverse (155120601222), we get a palindrome (377226622773).

The spelling of 222106021551 in words is "two hundred twenty-two billion, one hundred six million, twenty-one thousand, five hundred fifty-one".