213621145434 has 12 divisors (see below), whose sum is σ = 462845815146. Its totient is φ = 71207048472.

The previous prime is 213621145433. The next prime is 213621145469. The reversal of 213621145434 is 434541126312.

213621145434 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 211 + 4 + 5 + 434 = 666.

It can be written as a sum of positive squares in only one way, i.e., 209578093209 + 4043052225 = 457797^2 + 63585^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213621145433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5933920689 + ... + 5933920724.

Almost surely, 2^213621145434 is an apocalyptic number.

213621145434 is an abundant number, since it is smaller than the sum of its proper divisors (249224669712).

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

213621145434 is a wasteful number, since it uses less digits than its factorization.

213621145434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11867841421 (or 11867841418 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The spelling of 213621145434 in words is "two hundred thirteen billion, six hundred twenty-one million, one hundred forty-five thousand, four hundred thirty-four".