71201021 has 2 divisors, whose sum is σ = 71201022. Its totient is φ = 71201020.

The previous prime is 71200993. The next prime is 71201033. The reversal of 71201021 is 12010217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43375396 + 27825625 = 6586^2 + 5275^2 .

It is a cyclic number.

It is not a de Polignac number, because 71201021 - 2⁶ = 71200957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71200987 and 71201005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71201521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35600510 + 35600511.

It is an arithmetic number, because the mean of its divisors is an integer number (35600511).

Almost surely, 2^71201021 is an apocalyptic number.

It is an amenable number.

71201021 is a deficient number, since it is larger than the sum of its proper divisors (1).

71201021 is an equidigital number, since it uses as much as digits as its factorization.

71201021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 71201021 is about 8438.0697437269. The cubic root of 71201021 is about 414.4722007545.

Adding to 71201021 its reverse (12010217), we get a palindrome (83211238).

The spelling of 71201021 in words is "seventy-one million, two hundred one thousand, twenty-one".