21515250230 has 16 divisors (see below), whose sum is σ = 39976723584. Its totient is φ = 8328483840.

The previous prime is 21515250221. The next prime is 21515250233. The reversal of 21515250230 is 3205251512.

It is a self number, because there is not a number n which added to its sum of digits gives 21515250230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515250233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34701707 + ... + 34702326.

It is an arithmetic number, because the mean of its divisors is an integer number (2498545224).

Almost surely, 2^21515250230 is an apocalyptic number.

21515250230 is a deficient number, since it is larger than the sum of its proper divisors (18461473354).

21515250230 is a wasteful number, since it uses less digits than its factorization.

21515250230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69404071.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 21515250230 in words is "twenty-one billion, five hundred fifteen million, two hundred fifty thousand, two hundred thirty".