212271690 has 32 divisors (see below), whose sum is σ = 539421120. Its totient is φ = 53275904.

The previous prime is 212271679. The next prime is 212271691. The reversal of 212271690 is 96172212.

It is a super-2 number, since 2×212271690² = 90118540750912200, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (212271691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207600 + ... + 208619.

It is an arithmetic number, because the mean of its divisors is an integer number (16856910).

Almost surely, 2^212271690 is an apocalyptic number.

212271690 is an abundant number, since it is smaller than the sum of its proper divisors (327149430).

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

212271690 is a wasteful number, since it uses less digits than its factorization.

212271690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416246.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 212271690 is about 14569.5466641897. The cubic root of 212271690 is about 596.5278063233.

The spelling of 212271690 in words is "two hundred twelve million, two hundred seventy-one thousand, six hundred ninety".