221213101022356 has 6 divisors (see below), whose sum is σ = 387122926789130. Its totient is φ = 110606550511176.

The previous prime is 221213101022281. The next prime is 221213101022357. The reversal of 221213101022356 is 653220101312122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 189292634989956 + 31920466032400 = 13758366^2 + 5649820^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221213101022357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27651637627791 + ... + 27651637627798.

Almost surely, 2^{221213101022356} is an apocalyptic number.

It is an amenable number.

221213101022356 is a deficient number, since it is larger than the sum of its proper divisors (165909825766774).

221213101022356 is a wasteful number, since it uses less digits than its factorization.

221213101022356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55303275255593 (or 55303275255591 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 221213101022356 its reverse (653220101312122), we get a palindrome (874433202334478).

The spelling of 221213101022356 in words is "two hundred twenty-one trillion, two hundred thirteen billion, one hundred one million, twenty-two thousand, three hundred fifty-six".