21031327487 has 32 divisors (see below), whose sum is σ = 24162001920. Its totient is φ = 18180910080.

The previous prime is 21031327483. The next prime is 21031327507. The reversal of 21031327487 is 78472313012.

It is a cyclic number.

It is not a de Polignac number, because 21031327487 - 2² = 21031327483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21031327487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031327483) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2153738 + ... + 2163480.

It is an arithmetic number, because the mean of its divisors is an integer number (755062560).

Almost surely, 2^21031327487 is an apocalyptic number.

21031327487 is a deficient number, since it is larger than the sum of its proper divisors (3130674433).

21031327487 is a wasteful number, since it uses less digits than its factorization.

21031327487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9983.

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 21031327487 in words is "twenty-one billion, thirty-one million, three hundred twenty-seven thousand, four hundred eighty-seven".