212991042 has 16 divisors (see below), whose sum is σ = 464707872. Its totient is φ = 64542720.

The previous prime is 212991041. The next prime is 212991061. The reversal of 212991042 is 240199212.

It is a happy number.

212991042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×212991042³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (212991041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1613503 + ... + 1613634.

It is an arithmetic number, because the mean of its divisors is an integer number (29044242).

Almost surely, 2^212991042 is an apocalyptic number.

212991042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

212991042 is an abundant number, since it is smaller than the sum of its proper divisors (251716830).

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

212991042 is a wasteful number, since it uses less digits than its factorization.

212991042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227153.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 212991042 is about 14594.2126200765. The cubic root of 212991042 is about 597.2008897204.

The spelling of 212991042 in words is "two hundred twelve million, nine hundred ninety-one thousand, forty-two".