21040120431 has 48 divisors (see below), whose sum is σ = 35244937728. Its totient is φ = 11953440000.

The previous prime is 21040120303. The next prime is 21040120457. The reversal of 21040120431 is 13402104012.

21040120431 is a `hidden beast` number, since 210 + 4 + 0 + 1 + 20 + 431 = 666.

It is not a de Polignac number, because 21040120431 - 2⁷ = 21040120303 is a prime.

It is a super-2 number, since 2×21040120431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040120531) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 397530 + ... + 447336.

It is an arithmetic number, because the mean of its divisors is an integer number (734269536).

Almost surely, 2^21040120431 is an apocalyptic number.

21040120431 is a deficient number, since it is larger than the sum of its proper divisors (14204817297).

21040120431 is a wasteful number, since it uses less digits than its factorization.

21040120431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50092 (or 50089 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21040120431 its reverse (13402104012), we get a palindrome (34442224443).

The spelling of 21040120431 in words is "twenty-one billion, forty million, one hundred twenty thousand, four hundred thirty-one".