71921012 has 12 divisors (see below), whose sum is σ = 127634976. Its totient is φ = 35453880.

The previous prime is 71920993. The next prime is 71921039. The reversal of 71921012 is 21012917.

It is a super-3 number, since 3×71921012³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126338 + ... + 126905.

It is an arithmetic number, because the mean of its divisors is an integer number (10636248).

Almost surely, 2^71921012 is an apocalyptic number.

It is an amenable number.

71921012 is a deficient number, since it is larger than the sum of its proper divisors (55713964).

71921012 is a wasteful number, since it uses less digits than its factorization.

71921012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253318 (or 253316 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 71921012 is about 8480.6256844646. The cubic root of 71921012 is about 415.8645777767.

Adding to 71921012 its reverse (21012917), we get a palindrome (92933929).

The spelling of 71921012 in words is "seventy-one million, nine hundred twenty-one thousand, twelve".