21040023011 has 8 divisors (see below), whose sum is σ = 24051001344. Its totient is φ = 18030359880.

The previous prime is 21040022933. The next prime is 21040023029. The reversal of 21040023011 is 11032004012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21040023011 is a prime.

It is a super-2 number, since 2×21040023011² (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 (21040025011) 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 7 ways as a sum of consecutive naturals, for example, 294275 + ... + 358716.

It is an arithmetic number, because the mean of its divisors is an integer number (3006375168).

Almost surely, 2^21040023011 is an apocalyptic number.

21040023011 is a deficient number, since it is larger than the sum of its proper divisors (3010978333).

21040023011 is an equidigital number, since it uses as much as digits as its factorization.

21040023011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657601.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21040023011 its reverse (11032004012), we get a palindrome (32072027023).

The spelling of 21040023011 in words is "twenty-one billion, forty million, twenty-three thousand, eleven".