2211222121021 has 4 divisors (see below), whose sum is σ = 2211225120000. Its totient is φ = 2211219122044.

The previous prime is 2211222120941. The next prime is 2211222121033. The reversal of 2211222121021 is 1201212221122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2211222121021 - 2¹⁵ = 2211222088253 is a prime.

It is a super-3 number, since 3×2211222121021³ (a number of 38 digits) contains 333 as substring.

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 2211222121021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211222121081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460260 + ... + 2152738.

It is an arithmetic number, because the mean of its divisors is an integer number (552806280000).

Almost surely, 2^{2211222121021} is an apocalyptic number.

It is an amenable number.

2211222121021 is a deficient number, since it is larger than the sum of its proper divisors (2998979).

2211222121021 is a wasteful number, since it uses less digits than its factorization.

2211222121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2998978.

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

Adding to 2211222121021 its reverse (1201212221122), we get a palindrome (3412434342143).

The spelling of 2211222121021 in words is "two trillion, two hundred eleven billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-one".