221211012020122 has 4 divisors (see below), whose sum is σ = 331816518030186. Its totient is φ = 110605506010060.

The previous prime is 221211012020101. The next prime is 221211012020149. The reversal of 221211012020122 is 221020210112122.

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

It can be written as a sum of positive squares in only one way, i.e., 209291456014281 + 11919556005841 = 14466909^2 + 3452471^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221211012020122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55302753005029 + ... + 55302753005032.

Almost surely, 2^{221211012020122} is an apocalyptic number.

221211012020122 is a deficient number, since it is larger than the sum of its proper divisors (110605506010064).

221211012020122 is a wasteful number, since it uses less digits than its factorization.

221211012020122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110605506010063.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221211012020122 its reverse (221020210112122), we get a palindrome (442231222132244).

The spelling of 221211012020122 in words is "two hundred twenty-one trillion, two hundred eleven billion, twelve million, twenty thousand, one hundred twenty-two".