21111005694 has 16 divisors (see below), whose sum is σ = 42397209360. Its totient is φ = 7007802240.

The previous prime is 21111005693. The next prime is 21111005717. The reversal of 21111005694 is 49650011112.

It is a super-2 number, since 2×21111005694² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111005693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7298349 + ... + 7301240.

It is an arithmetic number, because the mean of its divisors is an integer number (2649825585).

Almost surely, 2^21111005694 is an apocalyptic number.

21111005694 is an abundant number, since it is smaller than the sum of its proper divisors (21286203666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111005694 is a wasteful number, since it uses less digits than its factorization.

21111005694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14599835.

The product of its (nonzero) digits is 2160, while the sum is 30.

The spelling of 21111005694 in words is "twenty-one billion, one hundred eleven million, five thousand, six hundred ninety-four".