212222210021 has 16 divisors (see below), whose sum is σ = 226596040704. Its totient is φ = 198064445184.

The previous prime is 212222210009. The next prime is 212222210027. The reversal of 212222210021 is 120012222212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212222210021 - 2¹⁴ = 212222193637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212222210027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1032200 + ... + 1220606.

It is an arithmetic number, because the mean of its divisors is an integer number (14162252544).

Almost surely, 2^212222210021 is an apocalyptic number.

It is an amenable number.

212222210021 is a deficient number, since it is larger than the sum of its proper divisors (14373830683).

212222210021 is a wasteful number, since it uses less digits than its factorization.

212222210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188980.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212222210021 its reverse (120012222212), we get a palindrome (332234432233).

The spelling of 212222210021 in words is "two hundred twelve billion, two hundred twenty-two million, two hundred ten thousand, twenty-one".