2111222001221 has 16 divisors (see below), whose sum is σ = 2138281251840. Its totient is φ = 2084387545920.

The previous prime is 2111222001149. The next prime is 2111222001233. The reversal of 2111222001221 is 1221002221112.

It is a cyclic number.

It is not a de Polignac number, because 2111222001221 - 2²² = 2111217806917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2111222001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111222001271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13789130 + ... + 13941396.

It is an arithmetic number, because the mean of its divisors is an integer number (133642578240).

Almost surely, 2^{2111222001221} is an apocalyptic number.

It is an amenable number.

2111222001221 is a deficient number, since it is larger than the sum of its proper divisors (27059250619).

2111222001221 is a wasteful number, since it uses less digits than its factorization.

2111222001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153004.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2111222001221 its reverse (1221002221112), we get a palindrome (3332224222333).

The spelling of 2111222001221 in words is "two trillion, one hundred eleven billion, two hundred twenty-two million, one thousand, two hundred twenty-one".