21327447420 has 120 divisors (see below), whose sum is σ = 67066056288. Its totient is φ = 5673628800.

The previous prime is 21327447413. The next prime is 21327447433. The reversal of 21327447420 is 2474472312.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 666385 + ... + 697655.

Almost surely, 2^21327447420 is an apocalyptic number.

21327447420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21327447420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33533028144).

21327447420 is an abundant number, since it is smaller than the sum of its proper divisors (45738608868).

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

21327447420 is a wasteful number, since it uses less digits than its factorization.

21327447420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31713 (or 31702 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The spelling of 21327447420 in words is "twenty-one billion, three hundred twenty-seven million, four hundred forty-seven thousand, four hundred twenty".