21487469507 has 4 divisors (see below), whose sum is σ = 24557108016. Its totient is φ = 18417831000.

The previous prime is 21487469477. The next prime is 21487469519. The reversal of 21487469507 is 70596478412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21487469507 - 2¹⁸ = 21487207363 is a prime.

It is a super-2 number, since 2×21487469507² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21487469537) 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, 1534819244 + ... + 1534819257.

It is an arithmetic number, because the mean of its divisors is an integer number (6139277004).

Almost surely, 2^21487469507 is an apocalyptic number.

21487469507 is a deficient number, since it is larger than the sum of its proper divisors (3069638509).

21487469507 is an equidigital number, since it uses as much as digits as its factorization.

21487469507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3069638508.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 21487469507 in words is "twenty-one billion, four hundred eighty-seven million, four hundred sixty-nine thousand, five hundred seven".