2221111221021 has 72 divisors (see below), whose sum is σ = 4138094439648. Its totient is φ = 1134908712000.

The previous prime is 2221111220981. The next prime is 2221111221023. The reversal of 2221111221021 is 1201221111222.

It is not a de Polignac number, because 2221111221021 - 2¹⁹ = 2221110696733 is a prime.

It is a super-2 number, since 2×2221111221021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2221111220985 and 2221111221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221111221023) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3457095 + ... + 4048916.

It is an arithmetic number, because the mean of its divisors is an integer number (57473533884).

Almost surely, 2^{2221111221021} is an apocalyptic number.

2221111221021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2221111221021 is a deficient number, since it is larger than the sum of its proper divisors (1916983218627).

2221111221021 is a wasteful number, since it uses less digits than its factorization.

2221111221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7506103 (or 7506093 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2221111221021 its reverse (1201221111222), we get a palindrome (3422332332243).

The spelling of 2221111221021 in words is "two trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, twenty-one".