21489660294 has 8 divisors (see below), whose sum is σ = 42979320600. Its totient is φ = 7163220096.

The previous prime is 21489660287. The next prime is 21489660331. The reversal of 21489660294 is 49206698412.

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

21489660294 is an admirable number.

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, 1790805019 + ... + 1790805030.

It is an arithmetic number, because the mean of its divisors is an integer number (5372415075).

Almost surely, 2^21489660294 is an apocalyptic number.

21489660294 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21489660294 is a wasteful number, since it uses less digits than its factorization.

21489660294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3581610054.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 21489660294 in words is "twenty-one billion, four hundred eighty-nine million, six hundred sixty thousand, two hundred ninety-four".