21347539200 has 1296 divisors, whose sum is σ = 91837247040. Its totient is φ = 4830658560.

The previous prime is 21347539181. The next prime is 21347539223. The reversal of 21347539200 is 293574312.

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

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 496454379 + ... + 496454421.

Almost surely, 2^21347539200 is an apocalyptic number.

21347539200 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 21347539200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45918623520).

21347539200 is an abundant number, since it is smaller than the sum of its proper divisors (70489707840).

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

21347539200 is a wasteful number, since it uses less digits than its factorization.

21347539200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The spelling of 21347539200 in words is "twenty-one billion, three hundred forty-seven million, five hundred thirty-nine thousand, two hundred".