21423332403 has 12 divisors (see below), whose sum is σ = 33757978488. Its totient is φ = 12983837760.

The previous prime is 21423332389. The next prime is 21423332461. The reversal of 21423332403 is 30423332412.

21423332403 is a `hidden beast` number, since 21 + 4 + 233 + 3 + 2 + 403 = 666.

It is not a de Polignac number, because 21423332403 - 2¹⁸ = 21423070259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21423332473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108198550 + ... + 108198747.

It is an arithmetic number, because the mean of its divisors is an integer number (2813164874).

Almost surely, 2^21423332403 is an apocalyptic number.

21423332403 is a deficient number, since it is larger than the sum of its proper divisors (12334646085).

21423332403 is a wasteful number, since it uses less digits than its factorization.

21423332403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216397314 (or 216397311 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21423332403 its reverse (30423332412), we get a palindrome (51846664815).

Subtracting 21423332403 from its reverse (30423332412), we obtain a palindrome (9000000009).

The spelling of 21423332403 in words is "twenty-one billion, four hundred twenty-three million, three hundred thirty-two thousand, four hundred three".