21231171070 has 16 divisors (see below), whose sum is σ = 38217942288. Its totient is φ = 8492060800.

The previous prime is 21231171047. The next prime is 21231171107. The reversal of 21231171070 is 7017113212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255657 + ... + 328363.

It is an arithmetic number, because the mean of its divisors is an integer number (2388621393).

Almost surely, 2^21231171070 is an apocalyptic number.

21231171070 is a deficient number, since it is larger than the sum of its proper divisors (16986771218).

21231171070 is a wasteful number, since it uses less digits than its factorization.

21231171070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101915.

The product of its (nonzero) digits is 588, while the sum is 25.

Adding to 21231171070 its reverse (7017113212), we get a palindrome (28248284282).

The spelling of 21231171070 in words is "twenty-one billion, two hundred thirty-one million, one hundred seventy-one thousand, seventy".