71422021 has 4 divisors (see below), whose sum is σ = 77914944. Its totient is φ = 64929100.

The previous prime is 71422019. The next prime is 71422031. The reversal of 71422021 is 12022417.

It is a happy number.

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 71422021 - 2¹ = 71422019 is a prime.

It is a super-2 number, since 2×71422021² = 10202210167448882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71422021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71422031) 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, 3246445 + ... + 3246466.

It is an arithmetic number, because the mean of its divisors is an integer number (19478736).

Almost surely, 2^71422021 is an apocalyptic number.

It is an amenable number.

71422021 is a deficient number, since it is larger than the sum of its proper divisors (6492923).

71422021 is a wasteful number, since it uses less digits than its factorization.

71422021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6492922.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 71422021 is about 8451.1550098197. The cubic root of 71422021 is about 414.9005829500.

Adding to 71422021 its reverse (12022417), we get a palindrome (83444438).

The spelling of 71422021 in words is "seventy-one million, four hundred twenty-two thousand, twenty-one".