21152421343 has 8 divisors (see below), whose sum is σ = 22413840912. Its totient is φ = 19892908416.

The previous prime is 21152421341. The next prime is 21152421349. The reversal of 21152421343 is 34312425112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21152421343 - 2¹ = 21152421341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152421341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453780 + ... + 498217.

It is an arithmetic number, because the mean of its divisors is an integer number (2801730114).

Almost surely, 2^21152421343 is an apocalyptic number.

21152421343 is a deficient number, since it is larger than the sum of its proper divisors (1261419569).

21152421343 is a wasteful number, since it uses less digits than its factorization.

21152421343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953321.

The product of its digits is 5760, while the sum is 28.

Adding to 21152421343 its reverse (34312425112), we get a palindrome (55464846455).

The spelling of 21152421343 in words is "twenty-one billion, one hundred fifty-two million, four hundred twenty-one thousand, three hundred forty-three".