212322990 has 32 divisors (see below), whose sum is σ = 555901056. Its totient is φ = 51472160.

The previous prime is 212322961. The next prime is 212322991. The reversal of 212322990 is 99223212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212322991) 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, 321372 + ... + 322031.

It is an arithmetic number, because the mean of its divisors is an integer number (17371908).

Almost surely, 2^212322990 is an apocalyptic number.

212322990 is an abundant number, since it is smaller than the sum of its proper divisors (343578066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212322990 is a wasteful number, since it uses less digits than its factorization.

212322990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643424.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 212322990 is about 14571.3070793255. The cubic root of 212322990 is about 596.5758570260.

It can be divided in two parts, 212322 and 990, that added together give a palindrome (213312).

The spelling of 212322990 in words is "two hundred twelve million, three hundred twenty-two thousand, nine hundred ninety".