71029021 has 4 divisors (see below), whose sum is σ = 81176032. Its totient is φ = 60882012.

The previous prime is 71029019. The next prime is 71029027. The reversal of 71029021 is 12092017.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71029021 - 2¹ = 71029019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71028983 and 71029001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71029027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5073495 + ... + 5073508.

It is an arithmetic number, because the mean of its divisors is an integer number (20294008).

Almost surely, 2^71029021 is an apocalyptic number.

It is an amenable number.

71029021 is a deficient number, since it is larger than the sum of its proper divisors (10147011).

71029021 is a wasteful number, since it uses less digits than its factorization.

71029021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10147010.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 71029021 is about 8427.8716767640. The cubic root of 71029021 is about 414.1381854129.

The spelling of 71029021 in words is "seventy-one million, twenty-nine thousand, twenty-one".