21321171478 has 8 divisors (see below), whose sum is σ = 32031652680. Its totient is φ = 10643953920.

The previous prime is 21321171467. The next prime is 21321171491. The reversal of 21321171478 is 87417112312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8314308 + ... + 8316871.

It is an arithmetic number, because the mean of its divisors is an integer number (4003956585).

Almost surely, 2^21321171478 is an apocalyptic number.

21321171478 is a deficient number, since it is larger than the sum of its proper divisors (10710481202).

21321171478 is a wasteful number, since it uses less digits than its factorization.

21321171478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16631822.

The product of its digits is 18816, while the sum is 37.

The spelling of 21321171478 in words is "twenty-one billion, three hundred twenty-one million, one hundred seventy-one thousand, four hundred seventy-eight".