21122210112121 has 8 divisors (see below), whose sum is σ = 22233961058400. Its totient is φ = 20010464733600.

The previous prime is 21122210112067. The next prime is 21122210112149. The reversal of 21122210112121 is 12121101222112.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21122210112121 is a prime.

It is a super-2 number, since 2×21122210112121² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122210112721) 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, 8030646 + ... + 10331296.

It is an arithmetic number, because the mean of its divisors is an integer number (2779245132300).

Almost surely, 2^{21122210112121} is an apocalyptic number.

It is an amenable number.

21122210112121 is a deficient number, since it is larger than the sum of its proper divisors (1111750946279).

21122210112121 is a wasteful number, since it uses less digits than its factorization.

21122210112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783879.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21122210112121 its reverse (12121101222112), we get a palindrome (33243311334233).

The spelling of 21122210112121 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred ten million, one hundred twelve thousand, one hundred twenty-one".