21403342023 has 40 divisors (see below), whose sum is σ = 34655845248. Its totient is φ = 11510097792.

The previous prime is 21403342007. The next prime is 21403342027. The reversal of 21403342023 is 32024330412.

It is not a de Polignac number, because 21403342023 - 2⁴ = 21403342007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21403341984 and 21403342002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403342027) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1747840 + ... + 1760042.

Almost surely, 2^21403342023 is an apocalyptic number.

21403342023 is a deficient number, since it is larger than the sum of its proper divisors (13252503225).

21403342023 is an frugal number, since it uses more digits than its factorization.

21403342023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12281 (or 12230 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21403342023 its reverse (32024330412), we get a palindrome (53427672435).

The spelling of 21403342023 in words is "twenty-one billion, four hundred three million, three hundred forty-two thousand, twenty-three".