21111120001 has 16 divisors (see below), whose sum is σ = 23007362560. Its totient is φ = 19297232640.

The previous prime is 21111119977. The next prime is 21111120011. The reversal of 21111120001 is 10002111112.

It is a cyclic number.

It is not a de Polignac number, because 21111120001 - 2¹⁵ = 21111087233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21111120001.

It is not an unprimeable number, because it can be changed into a prime (21111120011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145315 + ... + 251671.

It is an arithmetic number, because the mean of its divisors is an integer number (1437960160).

Almost surely, 2^21111120001 is an apocalyptic number.

It is an amenable number.

21111120001 is a deficient number, since it is larger than the sum of its proper divisors (1896242559).

21111120001 is a wasteful number, since it uses less digits than its factorization.

21111120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106744.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21111120001 its reverse (10002111112), we get a palindrome (31113231113).

The spelling of 21111120001 in words is "twenty-one billion, one hundred eleven million, one hundred twenty thousand, one".