21152502111 has 16 divisors (see below), whose sum is σ = 30423394400. Its totient is φ = 12995251200.

The previous prime is 21152502071. The next prime is 21152502113. The reversal of 21152502111 is 11120525112.

It is not a de Polignac number, because 21152502111 - 2⁶ = 21152502047 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 (21152502113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427786 + ... + 474663.

It is an arithmetic number, because the mean of its divisors is an integer number (1901462150).

Almost surely, 2^21152502111 is an apocalyptic number.

21152502111 is a deficient number, since it is larger than the sum of its proper divisors (9270892289).

21152502111 is a wasteful number, since it uses less digits than its factorization.

21152502111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903066.

The product of its (nonzero) digits is 200, while the sum is 21.

The spelling of 21152502111 in words is "twenty-one billion, one hundred fifty-two million, five hundred two thousand, one hundred eleven".