21050040431 has 16 divisors (see below), whose sum is σ = 24238614528. Its totient is φ = 17907264000.

The previous prime is 21050040377. The next prime is 21050040463. The reversal of 21050040431 is 13404005012.

It is a cyclic number.

It is not a de Polignac number, because 21050040431 - 2⁶ = 21050040367 is a prime.

It is a super-2 number, since 2×21050040431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050040331) 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, 564206 + ... + 600356.

It is an arithmetic number, because the mean of its divisors is an integer number (1514913408).

Almost surely, 2^21050040431 is an apocalyptic number.

21050040431 is a deficient number, since it is larger than the sum of its proper divisors (3188574097).

21050040431 is a wasteful number, since it uses less digits than its factorization.

21050040431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36782.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 21050040431 its reverse (13404005012), we get a palindrome (34454045443).

The spelling of 21050040431 in words is "twenty-one billion, fifty million, forty thousand, four hundred thirty-one".