21295471040 has 28 divisors (see below), whose sum is σ = 50709841176. Its totient is φ = 8518188288.

The previous prime is 21295471037. The next prime is 21295471069. The reversal of 21295471040 is 4017459212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33273854 + ... + 33274493.

Almost surely, 2^21295471040 is an apocalyptic number.

21295471040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21295471040 is an abundant number, since it is smaller than the sum of its proper divisors (29414370136).

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

21295471040 is an equidigital number, since it uses as much as digits as its factorization.

21295471040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66548364 (or 66548354 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 21295471040 in words is "twenty-one billion, two hundred ninety-five million, four hundred seventy-one thousand, forty".