212201990 has 256 divisors, whose sum is σ = 574801920. Its totient is φ = 54190080.

The previous prime is 212201989. The next prime is 212202017. The reversal of 212201990 is 99102212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4934909 + ... + 4934951.

It is an arithmetic number, because the mean of its divisors is an integer number (2245320).

Almost surely, 2^212201990 is an apocalyptic number.

212201990 is an abundant number, since it is smaller than the sum of its proper divisors (362599930).

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

212201990 is a wasteful number, since it uses less digits than its factorization.

212201990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 212201990 is about 14567.1544922130. The cubic root of 212201990 is about 596.4625086542.

It can be divided in two parts, 212 and 201990, that added together give a palindrome (202202).

The spelling of 212201990 in words is "two hundred twelve million, two hundred one thousand, nine hundred ninety".