21421331224403 has 6 divisors (see below), whose sum is σ = 23545760767452. Its totient is φ = 19473937476620.

The previous prime is 21421331224343. The next prime is 21421331224417. The reversal of 21421331224403 is 30442213312412.

It is a happy number.

It is not a de Polignac number, because 21421331224403 - 2¹⁶ = 21421331158867 is a prime.

It is a super-2 number, since 2×21421331224403² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21421331224403.

It is not an unprimeable number, because it can be changed into a prime (21421331224903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88517897501 + ... + 88517897742.

It is an arithmetic number, because the mean of its divisors is an integer number (3924293461242).

Almost surely, 2^{21421331224403} is an apocalyptic number.

21421331224403 is a deficient number, since it is larger than the sum of its proper divisors (2124429543049).

21421331224403 is a wasteful number, since it uses less digits than its factorization.

21421331224403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177035795265 (or 177035795254 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21421331224403 its reverse (30442213312412), we get a palindrome (51863544536815).

The spelling of 21421331224403 in words is "twenty-one trillion, four hundred twenty-one billion, three hundred thirty-one million, two hundred twenty-four thousand, four hundred three".