21423111212011 has 8 divisors (see below), whose sum is σ = 21431100480048. Its totient is φ = 21415122300000.

The previous prime is 21423111211991. The next prime is 21423111212033. The reversal of 21423111212011 is 11021211132412.

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

It is a cyclic number.

It is not a de Polignac number, because 21423111212011 - 2⁷ = 21423111211883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423111212411) 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, 211952436 + ... + 212053486.

It is an arithmetic number, because the mean of its divisors is an integer number (2678887560006).

Almost surely, 2^{21423111212011} is an apocalyptic number.

21423111212011 is a deficient number, since it is larger than the sum of its proper divisors (7989268037).

21423111212011 is a wasteful number, since it uses less digits than its factorization.

21423111212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178013.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 21423111212011 its reverse (11021211132412), we get a palindrome (32444322344423).

The spelling of 21423111212011 in words is "twenty-one trillion, four hundred twenty-three billion, one hundred eleven million, two hundred twelve thousand, eleven".