21343929600 has 540 divisors, whose sum is σ = 82351909696. Its totient is φ = 4868075520.

The previous prime is 21343929589. The next prime is 21343929611. The reversal of 21343929600 is 692934312.

It is an interprime number because it is at equal distance from previous prime (21343929589) and next prime (21343929611).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 46098969 + ... + 46099431.

Almost surely, 2^21343929600 is an apocalyptic number.

21343929600 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 21343929600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41175954848).

21343929600 is an abundant number, since it is smaller than the sum of its proper divisors (61007980096).

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

21343929600 is an frugal number, since it uses more digits than its factorization.

21343929600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The spelling of 21343929600 in words is "twenty-one billion, three hundred forty-three million, nine hundred twenty-nine thousand, six hundred".