1222000021221 has 64 divisors (see below), whose sum is σ = 1912681267200. Its totient is φ = 679634032896.

The previous prime is 1222000021183. The next prime is 1222000021259. The reversal of 1222000021221 is 1221200002221.

It is an interprime number because it is at equal distance from previous prime (1222000021183) and next prime (1222000021259).

It is not a de Polignac number, because 1222000021221 - 2⁷ = 1222000021093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222000021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222000023221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 35606556 + ... + 35640858.

It is an arithmetic number, because the mean of its divisors is an integer number (29885644800).

Almost surely, 2^{1222000021221} is an apocalyptic number.

It is an amenable number.

1222000021221 is a deficient number, since it is larger than the sum of its proper divisors (690681245979).

1222000021221 is a wasteful number, since it uses less digits than its factorization.

1222000021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34698.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1222000021221 its reverse (1221200002221), we get a palindrome (2443200023442).

The spelling of 1222000021221 in words is "one trillion, two hundred twenty-two billion, twenty-one thousand, two hundred twenty-one".