212121922 has 4 divisors (see below), whose sum is σ = 318182886. Its totient is φ = 106060960.

The previous prime is 212121919. The next prime is 212121929. The reversal of 212121922 is 229121212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 169754841 + 42367081 = 13029^2 + 6509^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212121893 and 212121902.

It is not an unprimeable number, because it can be changed into a prime (212121929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53030479 + ... + 53030482.

Almost surely, 2^212121922 is an apocalyptic number.

212121922 is a deficient number, since it is larger than the sum of its proper divisors (106060964).

212121922 is a wasteful number, since it uses less digits than its factorization.

212121922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106060963.

The product of its digits is 288, while the sum is 22.

The square root of 212121922 is about 14564.4059954397. The cubic root of 212121922 is about 596.3874801904.

The spelling of 212121922 in words is "two hundred twelve million, one hundred twenty-one thousand, nine hundred twenty-two".