213242540 has 24 divisors (see below), whose sum is σ = 511782432. Its totient is φ = 73111680.

The previous prime is 213242537. The next prime is 213242551. The reversal of 213242540 is 45242312.

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, 761441 + ... + 761720.

It is an arithmetic number, because the mean of its divisors is an integer number (21324268).

Almost surely, 2^213242540 is an apocalyptic number.

213242540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213242540 is an abundant number, since it is smaller than the sum of its proper divisors (298539892).

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

213242540 is a wasteful number, since it uses less digits than its factorization.

213242540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523177 (or 1523175 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 213242540 is about 14602.8264387412. The cubic root of 213242540 is about 597.4358538304.

Adding to 213242540 its reverse (45242312), we get a palindrome (258484852).

The spelling of 213242540 in words is "two hundred thirteen million, two hundred forty-two thousand, five hundred forty".