21496691604 has 12 divisors (see below), whose sum is σ = 50158947104. Its totient is φ = 7165563864.

The previous prime is 21496691597. The next prime is 21496691621. The reversal of 21496691604 is 40619669412.

It is a tau number, because it is divible by the number of its divisors (12).

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, 895695472 + ... + 895695495.

Almost surely, 2^21496691604 is an apocalyptic number.

It is an amenable number.

21496691604 is an abundant number, since it is smaller than the sum of its proper divisors (28662255500).

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

21496691604 is a wasteful number, since it uses less digits than its factorization.

21496691604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791390974 (or 1791390972 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The spelling of 21496691604 in words is "twenty-one billion, four hundred ninety-six million, six hundred ninety-one thousand, six hundred four".