21343001400 has 144 divisors (see below), whose sum is σ = 81916520400. Its totient is φ = 4878397440.

The previous prime is 21343001399. The next prime is 21343001401. The reversal of 21343001400 is 410034312.

It is an interprime number because it is at equal distance from previous prime (21343001399) and next prime (21343001401).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343001401) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 834345 + ... + 859544.

It is an arithmetic number, because the mean of its divisors is an integer number (568864725).

Almost surely, 2^21343001400 is an apocalyptic number.

21343001400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21343001400 is an abundant number, since it is smaller than the sum of its proper divisors (60573519000).

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

21343001400 is a wasteful number, since it uses less digits than its factorization.

21343001400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1693918 (or 1693906 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21343001400 its reverse (410034312), we get a palindrome (21753035712).

The spelling of 21343001400 in words is "twenty-one billion, three hundred forty-three million, one thousand, four hundred".