21731519230 has 32 divisors (see below), whose sum is σ = 41202956160. Its totient is φ = 8229612960.

The previous prime is 21731519221. The next prime is 21731519231. The reversal of 21731519230 is 3291513712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21731519231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253537 + ... + 328243.

It is an arithmetic number, because the mean of its divisors is an integer number (1287592380).

Almost surely, 2^21731519230 is an apocalyptic number.

21731519230 is a deficient number, since it is larger than the sum of its proper divisors (19471436930).

21731519230 is a wasteful number, since it uses less digits than its factorization.

21731519230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76264.

The product of its (nonzero) digits is 11340, while the sum is 34.

The spelling of 21731519230 in words is "twenty-one billion, seven hundred thirty-one million, five hundred nineteen thousand, two hundred thirty".