21121334403 has 8 divisors (see below), whose sum is σ = 30328069968. Its totient is φ = 12997744224.

The previous prime is 21121334387. The next prime is 21121334407. The reversal of 21121334403 is 30443312112.

It is a happy number.

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

It is not a de Polignac number, because 21121334403 - 2⁴ = 21121334387 is a prime.

It is a super-2 number, since 2×21121334403² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121334407) 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, 270786300 + ... + 270786377.

It is an arithmetic number, because the mean of its divisors is an integer number (3791008746).

Almost surely, 2^21121334403 is an apocalyptic number.

21121334403 is a deficient number, since it is larger than the sum of its proper divisors (9206735565).

21121334403 is a wasteful number, since it uses less digits than its factorization.

21121334403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541572693.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21121334403 its reverse (30443312112), we get a palindrome (51564646515).

The spelling of 21121334403 in words is "twenty-one billion, one hundred twenty-one million, three hundred thirty-four thousand, four hundred three".