21401013111 has 4 divisors (see below), whose sum is σ = 28534684152. Its totient is φ = 14267342072.

The previous prime is 21401013103. The next prime is 21401013121. The reversal of 21401013111 is 11131010412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21401013111 - 2³ = 21401013103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401013121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566835516 + ... + 3566835521.

It is an arithmetic number, because the mean of its divisors is an integer number (7133671038).

Almost surely, 2^21401013111 is an apocalyptic number.

21401013111 is a deficient number, since it is larger than the sum of its proper divisors (7133671041).

21401013111 is an equidigital number, since it uses as much as digits as its factorization.

21401013111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7133671040.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21401013111 its reverse (11131010412), we get a palindrome (32532023523).

The spelling of 21401013111 in words is "twenty-one billion, four hundred one million, thirteen thousand, one hundred eleven".