21431233042 has 16 divisors (see below), whose sum is σ = 32698692000. Its totient is φ = 10531746720.

The previous prime is 21431233003. The next prime is 21431233051. The reversal of 21431233042 is 24033213412.

It is a junction number, because it is equal to n+sod(n) for n = 21431232998 and 21431233016.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626317 + ... + 659647.

It is an arithmetic number, because the mean of its divisors is an integer number (2043668250).

Almost surely, 2^21431233042 is an apocalyptic number.

21431233042 is a deficient number, since it is larger than the sum of its proper divisors (11267458958).

21431233042 is a wasteful number, since it uses less digits than its factorization.

21431233042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38841.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21431233042 its reverse (24033213412), we get a palindrome (45464446454).

The spelling of 21431233042 in words is "twenty-one billion, four hundred thirty-one million, two hundred thirty-three thousand, forty-two".