2222212021 has 4 divisors (see below), whose sum is σ = 2223549952. Its totient is φ = 2220874092.

The previous prime is 2222212019. The next prime is 2222212061. The reversal of 2222212021 is 1202122222.

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.

It is a cyclic number.

It is not a de Polignac number, because 2222212021 - 2¹ = 2222212019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2222211986 and 2222212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222212061) 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, 666471 + ... + 669796.

It is an arithmetic number, because the mean of its divisors is an integer number (555887488).

Almost surely, 2^2222212021 is an apocalyptic number.

It is an amenable number.

2222212021 is a deficient number, since it is larger than the sum of its proper divisors (1337931).

2222212021 is a wasteful number, since it uses less digits than its factorization.

2222212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337930.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 2222212021 is about 47140.3438786778. The cubic root of 2222212021 is about 1304.9538835648.

Adding to 2222212021 its reverse (1202122222), we get a palindrome (3424334243).

It can be divided in two parts, 22222 and 12021, that added together give a palindrome (34243).

The spelling of 2222212021 in words is "two billion, two hundred twenty-two million, two hundred twelve thousand, twenty-one".