212021240 has 32 divisors (see below), whose sum is σ = 479327760. Its totient is φ = 84403200.

The previous prime is 212021239. The next prime is 212021311. The reversal of 212021240 is 42120212.

It is a super-2 number, since 2×212021240² = 89906012422275200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4121 + ... + 21000.

Almost surely, 2^212021240 is an apocalyptic number.

212021240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212021240 is an abundant number, since it is smaller than the sum of its proper divisors (267306520).

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

212021240 is a wasteful number, since it uses less digits than its factorization.

212021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25343 (or 25339 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 212021240 is about 14560.9491448875. The cubic root of 212021240 is about 596.2931083840.

Adding to 212021240 its reverse (42120212), we get a palindrome (254141452).

The spelling of 212021240 in words is "two hundred twelve million, twenty-one thousand, two hundred forty".