213031240 has 32 divisors (see below), whose sum is σ = 486077760. Its totient is φ = 84011200.

The previous prime is 213031223. The next prime is 213031271. The reversal of 213031240 is 42130312.

It is a happy 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, 34666 + ... + 40345.

It is an arithmetic number, because the mean of its divisors is an integer number (15189930).

Almost surely, 2^213031240 is an apocalyptic number.

213031240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213031240 is an abundant number, since it is smaller than the sum of its proper divisors (273046520).

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

213031240 is a wasteful number, since it uses less digits than its factorization.

213031240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75093 (or 75089 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 213031240 is about 14595.5897448510. The cubic root of 213031240 is about 597.2384574526.

Adding to 213031240 its reverse (42130312), we get a palindrome (255161552).

The spelling of 213031240 in words is "two hundred thirteen million, thirty-one thousand, two hundred forty".