21431333011 has 4 divisors (see below), whose sum is σ = 23379636024. Its totient is φ = 19483030000.

The previous prime is 21431332997. The next prime is 21431333083. The reversal of 21431333011 is 11033313412.

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 21431333011 - 2⁹ = 21431332499 is a prime.

It is a super-2 number, since 2×21431333011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431333111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974151490 + ... + 974151511.

It is an arithmetic number, because the mean of its divisors is an integer number (5844909006).

Almost surely, 2^21431333011 is an apocalyptic number.

21431333011 is a deficient number, since it is larger than the sum of its proper divisors (1948303013).

21431333011 is a wasteful number, since it uses less digits than its factorization.

21431333011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948303012.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21431333011 its reverse (11033313412), we get a palindrome (32464646423).

The spelling of 21431333011 in words is "twenty-one billion, four hundred thirty-one million, three hundred thirty-three thousand, eleven".