21152525111 has 4 divisors (see below), whose sum is σ = 22396791312. Its totient is φ = 19908258912.

The previous prime is 21152525101. The next prime is 21152525123. The reversal of 21152525111 is 11152525112.

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 21152525111 - 2²² = 21148330807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152525101) 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, 622133075 + ... + 622133108.

It is an arithmetic number, because the mean of its divisors is an integer number (5599197828).

Almost surely, 2^21152525111 is an apocalyptic number.

21152525111 is a deficient number, since it is larger than the sum of its proper divisors (1244266201).

21152525111 is a wasteful number, since it uses less digits than its factorization.

21152525111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244266200.

The product of its digits is 1000, while the sum is 26.

Subtracting from 21152525111 its reverse (11152525112), we obtain a palindrome (9999999999).

The spelling of 21152525111 in words is "twenty-one billion, one hundred fifty-two million, five hundred twenty-five thousand, one hundred eleven".