71021998 has 4 divisors (see below), whose sum is σ = 106533000. Its totient is φ = 35510998.

The previous prime is 71021989. The next prime is 71022001. The reversal of 71021998 is 89912017.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17755498 + ... + 17755501.

It is an arithmetic number, because the mean of its divisors is an integer number (26633250).

Almost surely, 2^71021998 is an apocalyptic number.

71021998 is a deficient number, since it is larger than the sum of its proper divisors (35511002).

71021998 is a wasteful number, since it uses less digits than its factorization.

71021998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35511001.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 71021998 is about 8427.4550132291. The cubic root of 71021998 is about 414.1245356479.

The spelling of 71021998 in words is "seventy-one million, twenty-one thousand, nine hundred ninety-eight".