71241921 has 12 divisors (see below), whose sum is σ = 103538448. Its totient is φ = 47202264.

The previous prime is 71241913. The next prime is 71241953. The reversal of 71241921 is 12914217.

It is not a de Polignac number, because 71241921 - 2³ = 71241913 is a prime.

It is a super-2 number, since 2×71241921² = 10150822615540482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71241421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22815 + ... + 25748.

It is an arithmetic number, because the mean of its divisors is an integer number (8628204).

Almost surely, 2^71241921 is an apocalyptic number.

It is an amenable number.

71241921 is a deficient number, since it is larger than the sum of its proper divisors (32296527).

71241921 is a wasteful number, since it uses less digits than its factorization.

71241921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48732 (or 48729 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 71241921 is about 8440.4929358421. The cubic root of 71241921 is about 414.5515473140.

It can be divided in two parts, 7124 and 1921, that added together give a triangular number (9045 = T₁₃₄).

The spelling of 71241921 in words is "seventy-one million, two hundred forty-one thousand, nine hundred twenty-one".