21498470031 has 4 divisors (see below), whose sum is σ = 28664626712. Its totient is φ = 14332313352.

The previous prime is 21498470009. The next prime is 21498470041. The reversal of 21498470031 is 13007489412.

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

It is not a de Polignac number, because 21498470031 - 2⁹ = 21498469519 is a prime.

It is a super-2 number, since 2×21498470031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21498470041) 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, 3583078336 + ... + 3583078341.

It is an arithmetic number, because the mean of its divisors is an integer number (7166156678).

Almost surely, 2^21498470031 is an apocalyptic number.

21498470031 is a deficient number, since it is larger than the sum of its proper divisors (7166156681).

21498470031 is an equidigital number, since it uses as much as digits as its factorization.

21498470031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7166156680.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 21498470031 in words is "twenty-one billion, four hundred ninety-eight million, four hundred seventy thousand, thirty-one".