21498131047 has 8 divisors (see below), whose sum is σ = 21737631152. Its totient is φ = 21259929600.

The previous prime is 21498131029. The next prime is 21498131111. The reversal of 21498131047 is 74013189412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21498131047 - 2³¹ = 19350647399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21498191047) 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, 291354 + ... + 357607.

It is an arithmetic number, because the mean of its divisors is an integer number (2717203894).

Almost surely, 2^21498131047 is an apocalyptic number.

21498131047 is a deficient number, since it is larger than the sum of its proper divisors (239500105).

21498131047 is a wasteful number, since it uses less digits than its factorization.

21498131047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649329.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 21498131047 in words is "twenty-one billion, four hundred ninety-eight million, one hundred thirty-one thousand, forty-seven".