21494368016 has 40 divisors (see below), whose sum is σ = 46997884800. Its totient is φ = 9433262720.

The previous prime is 21494367977. The next prime is 21494368067. The reversal of 21494368016 is 61086349412.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2100536 + ... + 2110743.

It is an arithmetic number, because the mean of its divisors is an integer number (1174947120).

Almost surely, 2^21494368016 is an apocalyptic number.

It is an amenable number.

21494368016 is an abundant number, since it is smaller than the sum of its proper divisors (25503516784).

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

21494368016 is a wasteful number, since it uses less digits than its factorization.

21494368016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4211327 (or 4211321 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 21494368016 in words is "twenty-one billion, four hundred ninety-four million, three hundred sixty-eight thousand, sixteen".