21406993410 has 64 divisors (see below), whose sum is σ = 56208297600. Its totient is φ = 5174676480.

The previous prime is 21406993409. The next prime is 21406993429. The reversal of 21406993410 is 1439960412.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22234 + ... + 208106.

It is an arithmetic number, because the mean of its divisors is an integer number (878254650).

Almost surely, 2^21406993410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21406993410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28104148800).

21406993410 is an abundant number, since it is smaller than the sum of its proper divisors (34801304190).

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

21406993410 is a wasteful number, since it uses less digits than its factorization.

21406993410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186243.

The product of its (nonzero) digits is 46656, while the sum is 39.

The spelling of 21406993410 in words is "twenty-one billion, four hundred six million, nine hundred ninety-three thousand, four hundred ten".