1222211100021 has 32 divisors (see below), whose sum is σ = 1692785635200. Its totient is φ = 783827687808.

The previous prime is 1222211100017. The next prime is 1222211100031. The reversal of 1222211100021 is 1200011122221.

It is not a de Polignac number, because 1222211100021 - 2² = 1222211100017 is a prime.

It is a super-3 number, since 3×1222211100021³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222211100031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78243750 + ... + 78259368.

It is an arithmetic number, because the mean of its divisors is an integer number (52899551100).

Almost surely, 2^{1222211100021} is an apocalyptic number.

It is an amenable number.

1222211100021 is a deficient number, since it is larger than the sum of its proper divisors (470574535179).

1222211100021 is an frugal number, since it uses more digits than its factorization.

1222211100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15926 (or 15748 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1222211100021 its reverse (1200011122221), we get a palindrome (2422222222242).

The spelling of 1222211100021 in words is "one trillion, two hundred twenty-two billion, two hundred eleven million, one hundred thousand, twenty-one".