21421140343 has 16 divisors (see below), whose sum is σ = 23303070144. Its totient is φ = 19608721920.

The previous prime is 21421140329. The next prime is 21421140347. The reversal of 21421140343 is 34304112412.

It is a cyclic number.

It is not a de Polignac number, because 21421140343 - 2²⁹ = 20884269431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421140347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2304421 + ... + 2313697.

It is an arithmetic number, because the mean of its divisors is an integer number (1456441884).

Almost surely, 2^21421140343 is an apocalyptic number.

21421140343 is a deficient number, since it is larger than the sum of its proper divisors (1881929801).

21421140343 is a wasteful number, since it uses less digits than its factorization.

21421140343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13002.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21421140343 its reverse (34304112412), we get a palindrome (55725252755).

The spelling of 21421140343 in words is "twenty-one billion, four hundred twenty-one million, one hundred forty thousand, three hundred forty-three".