21111571670 has 32 divisors (see below), whose sum is σ = 44927092800. Its totient is φ = 6988657536.

The previous prime is 21111571667. The next prime is 21111571697. The reversal of 21111571670 is 7617511112.

21111571670 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5197865 + ... + 5201924.

It is an arithmetic number, because the mean of its divisors is an integer number (1403971650).

Almost surely, 2^21111571670 is an apocalyptic number.

21111571670 is an abundant number, since it is smaller than the sum of its proper divisors (23815521130).

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

21111571670 is a wasteful number, since it uses less digits than its factorization.

21111571670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10399832.

The product of its (nonzero) digits is 2940, while the sum is 32.

The spelling of 21111571670 in words is "twenty-one billion, one hundred eleven million, five hundred seventy-one thousand, six hundred seventy".