21400212403 has 8 divisors (see below), whose sum is σ = 21996497600. Its totient is φ = 20804869440.

The previous prime is 21400212401. The next prime is 21400212409. The reversal of 21400212403 is 30421200412.

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 21400212403 - 2¹ = 21400212401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21400212401) 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, 189378 + ... + 280471.

It is an arithmetic number, because the mean of its divisors is an integer number (2749562200).

Almost surely, 2^21400212403 is an apocalyptic number.

21400212403 is a deficient number, since it is larger than the sum of its proper divisors (596285197).

21400212403 is a wasteful number, since it uses less digits than its factorization.

21400212403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471117.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21400212403 its reverse (30421200412), we get a palindrome (51821412815).

The spelling of 21400212403 in words is "twenty-one billion, four hundred million, two hundred twelve thousand, four hundred three".