21442521111 has 16 divisors (see below), whose sum is σ = 31237809408. Its totient is φ = 12975180800.

The previous prime is 21442521109. The next prime is 21442521127. The reversal of 21442521111 is 11112524412.

It is a cyclic number.

It is not a de Polignac number, because 21442521111 - 2¹ = 21442521109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21442521011) 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, 485691 + ... + 527996.

It is an arithmetic number, because the mean of its divisors is an integer number (1952363088).

Almost surely, 2^21442521111 is an apocalyptic number.

21442521111 is a deficient number, since it is larger than the sum of its proper divisors (9795288297).

21442521111 is a wasteful number, since it uses less digits than its factorization.

21442521111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014342.

The product of its digits is 640, while the sum is 24.

The spelling of 21442521111 in words is "twenty-one billion, four hundred forty-two million, five hundred twenty-one thousand, one hundred eleven".