21200531234 has 8 divisors (see below), whose sum is σ = 31819409820. Its totient is φ = 10594061296.

The previous prime is 21200531203. The next prime is 21200531237. The reversal of 21200531234 is 43213500212.

It can be written as a sum of positive squares in 2 ways, for example, as 17162310025 + 4038221209 = 131005^2 + 63547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21200531237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3097889 + ... + 3104724.

Almost surely, 2^21200531234 is an apocalyptic number.

21200531234 is a deficient number, since it is larger than the sum of its proper divisors (10618878586).

21200531234 is a wasteful number, since it uses less digits than its factorization.

21200531234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6204324.

The product of its (nonzero) digits is 1440, while the sum is 23.

The spelling of 21200531234 in words is "twenty-one billion, two hundred million, five hundred thirty-one thousand, two hundred thirty-four".