21142401233 has 4 divisors (see below), whose sum is σ = 21824414208. Its totient is φ = 20460388260.

The previous prime is 21142401223. The next prime is 21142401317. The reversal of 21142401233 is 33210424112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21142401233 - 2²⁴ = 21125624017 is a prime.

It is a super-2 number, since 2×21142401233² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21142401199 and 21142401208.

It is not an unprimeable number, because it can be changed into a prime (21142401223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341006441 + ... + 341006502.

It is an arithmetic number, because the mean of its divisors is an integer number (5456103552).

Almost surely, 2^21142401233 is an apocalyptic number.

It is an amenable number.

21142401233 is a deficient number, since it is larger than the sum of its proper divisors (682012975).

21142401233 is an equidigital number, since it uses as much as digits as its factorization.

21142401233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682012974.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21142401233 its reverse (33210424112), we get a palindrome (54352825345).

The spelling of 21142401233 in words is "twenty-one billion, one hundred forty-two million, four hundred one thousand, two hundred thirty-three".