21411042031 has 4 divisors (see below), whose sum is σ = 22537939000. Its totient is φ = 20284145064.

The previous prime is 21411042019. The next prime is 21411042047. The reversal of 21411042031 is 13024011412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21411042031 - 2¹⁹ = 21410517743 is a prime.

It is a super-2 number, since 2×21411042031² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 1126896949 = 21411042031 / (2 + 1 + 4 + 1 + 1 + 0 + 4 + 2 + 0 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411042091) 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, 563448456 + ... + 563448493.

It is an arithmetic number, because the mean of its divisors is an integer number (5634484750).

Almost surely, 2^21411042031 is an apocalyptic number.

21411042031 is a deficient number, since it is larger than the sum of its proper divisors (1126896969).

21411042031 is a wasteful number, since it uses less digits than its factorization.

21411042031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1126896968.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21411042031 its reverse (13024011412), we get a palindrome (34435053443).

The spelling of 21411042031 in words is "twenty-one billion, four hundred eleven million, forty-two thousand, thirty-one".