21132123433 has 16 divisors (see below), whose sum is σ = 22018233600. Its totient is φ = 20265194880.

The previous prime is 21132123413. The next prime is 21132123461. The reversal of 21132123433 is 33432123112.

It is a cyclic number.

It is not a de Polignac number, because 21132123433 - 2⁵ = 21132123401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21132123398 and 21132123407.

It is not an unprimeable number, because it can be changed into a prime (21132123413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1485408 + ... + 1499566.

It is an arithmetic number, because the mean of its divisors is an integer number (1376139600).

Almost surely, 2^21132123433 is an apocalyptic number.

It is an amenable number.

21132123433 is a deficient number, since it is larger than the sum of its proper divisors (886110167).

21132123433 is a wasteful number, since it uses less digits than its factorization.

21132123433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14832.

The product of its digits is 2592, while the sum is 25.

Adding to 21132123433 its reverse (33432123112), we get a palindrome (54564246545).

The spelling of 21132123433 in words is "twenty-one billion, one hundred thirty-two million, one hundred twenty-three thousand, four hundred thirty-three".