21012001001111 has 8 divisors (see below), whose sum is σ = 21769839996480. Its totient is φ = 20256381154912.

The previous prime is 21012001001099. The next prime is 21012001001141. The reversal of 21012001001111 is 11110010021012.

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 21012001001111 - 2²² = 21011996806807 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012001001092 and 21012001001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012001001141) 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, 554768015 + ... + 554805888.

It is an arithmetic number, because the mean of its divisors is an integer number (2721229999560).

Almost surely, 2^{21012001001111} is an apocalyptic number.

21012001001111 is a deficient number, since it is larger than the sum of its proper divisors (757838995369).

21012001001111 is a wasteful number, since it uses less digits than its factorization.

21012001001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109574585.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21012001001111 its reverse (11110010021012), we get a palindrome (32122011022123).

The spelling of 21012001001111 in words is "twenty-one trillion, twelve billion, one million, one thousand, one hundred eleven".