21111023001 has 8 divisors (see below), whose sum is σ = 28229150304. Its totient is φ = 14033455520.

The previous prime is 21111022997. The next prime is 21111023009. The reversal of 21111023001 is 10032011112.

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 21111023001 - 2² = 21111022997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21111023009) 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, 10138740 + ... + 10140821.

It is an arithmetic number, because the mean of its divisors is an integer number (3528643788).

Almost surely, 2^21111023001 is an apocalyptic number.

It is an amenable number.

21111023001 is a deficient number, since it is larger than the sum of its proper divisors (7118127303).

21111023001 is a wasteful number, since it uses less digits than its factorization.

21111023001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20279911.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21111023001 its reverse (10032011112), we get a palindrome (31143034113).

The spelling of 21111023001 in words is "twenty-one billion, one hundred eleven million, twenty-three thousand, one".