21031031196 has 72 divisors (see below), whose sum is σ = 61663172480. Its totient is φ = 5919176736.

The previous prime is 21031031149. The next prime is 21031031227. The reversal of 21031031196 is 69113013012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 605926 + ... + 639693.

Almost surely, 2^21031031196 is an apocalyptic number.

It is an amenable number.

21031031196 is an abundant number, since it is smaller than the sum of its proper divisors (40632141284).

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

21031031196 is a wasteful number, since it uses less digits than its factorization.

21031031196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245703 (or 1245698 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The spelling of 21031031196 in words is "twenty-one billion, thirty-one million, thirty-one thousand, one hundred ninety-six".