21488258247 has 32 divisors (see below), whose sum is σ = 30461184000. Its totient is φ = 13427501568.

The previous prime is 21488258227. The next prime is 21488258273. The reversal of 21488258247 is 74285288412.

It is not a de Polignac number, because 21488258247 - 2¹⁶ = 21488192711 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 21488258247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488258227) 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, 20681154 + ... + 20682192.

It is an arithmetic number, because the mean of its divisors is an integer number (951912000).

Almost surely, 2^21488258247 is an apocalyptic number.

21488258247 is a deficient number, since it is larger than the sum of its proper divisors (8972925753).

21488258247 is a wasteful number, since it uses less digits than its factorization.

21488258247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2335.

The product of its digits is 2293760, while the sum is 51.

The spelling of 21488258247 in words is "twenty-one billion, four hundred eighty-eight million, two hundred fifty-eight thousand, two hundred forty-seven".