21343121033 has 24 divisors (see below), whose sum is σ = 24061479768. Its totient is φ = 18905882112.

The previous prime is 21343121029. The next prime is 21343121057. The reversal of 21343121033 is 33012134312.

It can be written as a sum of positive squares in 12 ways, for example, as 1551414544 + 19791706489 = 39388^2 + 140683^2 .

It is not a de Polignac number, because 21343121033 - 2² = 21343121029 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21343126033) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 433091 + ... + 479847.

It is an arithmetic number, because the mean of its divisors is an integer number (1002561657).

Almost surely, 2^21343121033 is an apocalyptic number.

It is an amenable number.

21343121033 is a deficient number, since it is larger than the sum of its proper divisors (2718358735).

21343121033 is a wasteful number, since it uses less digits than its factorization.

21343121033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46893 (or 46880 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21343121033 its reverse (33012134312), we get a palindrome (54355255345).

The spelling of 21343121033 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty-one thousand, thirty-three".