21011212023 has 8 divisors (see below), whose sum is σ = 28918657536. Its totient is φ = 13555620600.

The previous prime is 21011211929. The next prime is 21011212031. The reversal of 21011212023 is 32021211012.

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

It is not a de Polignac number, because 21011212023 - 2¹⁶ = 21011146487 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011211993 and 21011212011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011212093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112963413 + ... + 112963598.

It is an arithmetic number, because the mean of its divisors is an integer number (3614832192).

Almost surely, 2^21011212023 is an apocalyptic number.

21011212023 is a deficient number, since it is larger than the sum of its proper divisors (7907445513).

21011212023 is a wasteful number, since it uses less digits than its factorization.

21011212023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225927045.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21011212023 its reverse (32021211012), we get a palindrome (53032423035).

The spelling of 21011212023 in words is "twenty-one billion, eleven million, two hundred twelve thousand, twenty-three".