213012990 has 80 divisors (see below), whose sum is σ = 602957520. Its totient is φ = 53809920.

The previous prime is 213012973. The next prime is 213012991. The reversal of 213012990 is 99210312.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213012991) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8470 + ... + 22310.

It is an arithmetic number, because the mean of its divisors is an integer number (7536969).

Almost surely, 2^213012990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213012990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301478760).

213012990 is an abundant number, since it is smaller than the sum of its proper divisors (389944530).

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

213012990 is a wasteful number, since it uses less digits than its factorization.

213012990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13879 (or 13870 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 213012990 is about 14594.9645426085. The cubic root of 213012990 is about 597.2214021870.

The spelling of 213012990 in words is "two hundred thirteen million, twelve thousand, nine hundred ninety".