21404515250 has 32 divisors (see below), whose sum is σ = 40309266816. Its totient is φ = 8510521200.

The previous prime is 21404515217. The next prime is 21404515291. The reversal of 21404515250 is 5251540412.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214592 + ... + 298091.

It is an arithmetic number, because the mean of its divisors is an integer number (1259664588).

Almost surely, 2^21404515250 is an apocalyptic number.

21404515250 is a deficient number, since it is larger than the sum of its proper divisors (18904751566).

21404515250 is a wasteful number, since it uses less digits than its factorization.

21404515250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512867 (or 512857 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 21404515250 in words is "twenty-one billion, four hundred four million, five hundred fifteen thousand, two hundred fifty".