212102403240 has 128 divisors (see below), whose sum is σ = 783147375360. Its totient is φ = 44751273984.

The previous prime is 212102403211. The next prime is 212102403251. The reversal of 212102403240 is 42304201212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9700729 + ... + 9722568.

It is an arithmetic number, because the mean of its divisors is an integer number (6118338870).

Almost surely, 2^212102403240 is an apocalyptic number.

212102403240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212102403240 is an abundant number, since it is smaller than the sum of its proper divisors (571044972120).

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

212102403240 is a wasteful number, since it uses less digits than its factorization.

212102403240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19423331 (or 19423327 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 212102403240 its reverse (42304201212), we get a palindrome (254406604452).

The spelling of 212102403240 in words is "two hundred twelve billion, one hundred two million, four hundred three thousand, two hundred forty".