212021110 has 32 divisors (see below), whose sum is σ = 461816640. Its totient is φ = 68416512.

The previous prime is 212021099. The next prime is 212021113. The reversal of 212021110 is 11120212.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021113) 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, 87895 + ... + 90274.

It is an arithmetic number, because the mean of its divisors is an integer number (14431770).

Almost surely, 2^212021110 is an apocalyptic number.

212021110 is an abundant number, since it is smaller than the sum of its proper divisors (249795530).

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

212021110 is a wasteful number, since it uses less digits than its factorization.

212021110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178200.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 212021110 is about 14560.9446808921. The cubic root of 212021110 is about 596.2929865124.

Adding to 212021110 its reverse (11120212), we get a palindrome (223141322).

The spelling of 212021110 in words is "two hundred twelve million, twenty-one thousand, one hundred ten".