222101111111021 has 4 divisors (see below), whose sum is σ = 223054334764092. Its totient is φ = 221147887457952.

The previous prime is 222101111110987. The next prime is 222101111111147. The reversal of 222101111111021 is 120111111101222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 157736770048900 + 64364341062121 = 12559330^2 + 8022739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222101111111021 is a prime.

It is a super-4 number, since 4×222101111111021⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222101111111221) 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, 476611826186 + ... + 476611826651.

It is an arithmetic number, because the mean of its divisors is an integer number (55763583691023).

Almost surely, 2^{222101111111021} is an apocalyptic number.

It is an amenable number.

222101111111021 is a deficient number, since it is larger than the sum of its proper divisors (953223653071).

222101111111021 is an equidigital number, since it uses as much as digits as its factorization.

222101111111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953223653070.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 222101111111021 its reverse (120111111101222), we get a palindrome (342212222212243).

The spelling of 222101111111021 in words is "two hundred twenty-two trillion, one hundred one billion, one hundred eleven million, one hundred eleven thousand, twenty-one".