71019021 has 16 divisors (see below), whose sum is σ = 99327744. Its totient is φ = 45082944.

The previous prime is 71019001. The next prime is 71019037. The reversal of 71019021 is 12091017.

It is not a de Polignac number, because 71019021 - 2⁵ = 71018989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71019001) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1590 + ... + 12023.

It is an arithmetic number, because the mean of its divisors is an integer number (6207984).

Almost surely, 2^71019021 is an apocalyptic number.

It is an amenable number.

71019021 is a deficient number, since it is larger than the sum of its proper divisors (28308723).

71019021 is a wasteful number, since it uses less digits than its factorization.

71019021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13700.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 71019021 is about 8427.2783862882. The cubic root of 71019021 is about 414.1187493376.

The spelling of 71019021 in words is "seventy-one million, nineteen thousand, twenty-one".