21029456896 has 88 divisors (see below), whose sum is σ = 48703206560. Its totient is φ = 8888942592.

The previous prime is 21029456879. The next prime is 21029456911. The reversal of 21029456896 is 69865492012.

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, 503170 + ... + 543358.

Almost surely, 2^21029456896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21029456896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24351603280).

21029456896 is an abundant number, since it is smaller than the sum of its proper divisors (27673749664).

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

21029456896 is an equidigital number, since it uses as much as digits as its factorization.

21029456896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40289 (or 40271 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 21029456896 in words is "twenty-one billion, twenty-nine million, four hundred fifty-six thousand, eight hundred ninety-six".