21010431206 has 24 divisors (see below), whose sum is σ = 33618857760. Its totient is φ = 9845827712.

The previous prime is 21010431193. The next prime is 21010431217. The reversal of 21010431206 is 60213401012.

It is a super-2 number, since 2×21010431206² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62096 + ... + 214188.

It is an arithmetic number, because the mean of its divisors is an integer number (1400785740).

Almost surely, 2^21010431206 is an apocalyptic number.

21010431206 is a deficient number, since it is larger than the sum of its proper divisors (12608426554).

21010431206 is a wasteful number, since it uses less digits than its factorization.

21010431206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152368 (or 152351 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21010431206 its reverse (60213401012), we get a palindrome (81223832218).

The spelling of 21010431206 in words is "twenty-one billion, ten million, four hundred thirty-one thousand, two hundred six".