22211210021221 has 8 divisors (see below), whose sum is σ = 23928890872824. Its totient is φ = 20494832917440.

The previous prime is 22211210021197. The next prime is 22211210021233. The reversal of 22211210021221 is 12212001211222.

It can be written as a sum of positive squares in 4 ways, for example, as 5543905702500 + 16667304318721 = 2354550^2 + 4082561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22211210021221 - 2¹⁹ = 22211209496933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22211210021261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325901566 + ... + 325969711.

It is an arithmetic number, because the mean of its divisors is an integer number (2991111359103).

Almost surely, 2^{22211210021221} is an apocalyptic number.

It is an amenable number.

22211210021221 is a deficient number, since it is larger than the sum of its proper divisors (1717680851603).

22211210021221 is a wasteful number, since it uses less digits than its factorization.

22211210021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651873911.

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

Adding to 22211210021221 its reverse (12212001211222), we get a palindrome (34423211232443).

The spelling of 22211210021221 in words is "twenty-two trillion, two hundred eleven billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".