21343140021 has 32 divisors (see below), whose sum is σ = 34332928000. Its totient is φ = 11520999360.

The previous prime is 21343139989. The next prime is 21343140073. The reversal of 21343140021 is 12004134312.

It is not a de Polignac number, because 21343140021 - 2⁵ = 21343139989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21343140021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343140821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62616 + ... + 215886.

It is an arithmetic number, because the mean of its divisors is an integer number (1072904000).

Almost surely, 2^21343140021 is an apocalyptic number.

21343140021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21343140021 is a deficient number, since it is larger than the sum of its proper divisors (12989787979).

21343140021 is a wasteful number, since it uses less digits than its factorization.

21343140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153649.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21343140021 its reverse (12004134312), we get a palindrome (33347274333).

The spelling of 21343140021 in words is "twenty-one billion, three hundred forty-three million, one hundred forty thousand, twenty-one".