70072021 has 2 divisors, whose sum is σ = 70072022. Its totient is φ = 70072020.

The previous prime is 70072001. The next prime is 70072027. The reversal of 70072021 is 12027007.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68724100 + 1347921 = 8290^2 + 1161^2 .

It is a cyclic number.

It is not a de Polignac number, because 70072021 - 2⁷ = 70071893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70072021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70072027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35036010 + 35036011.

It is an arithmetic number, because the mean of its divisors is an integer number (35036011).

Almost surely, 2^70072021 is an apocalyptic number.

It is an amenable number.

70072021 is a deficient number, since it is larger than the sum of its proper divisors (1).

70072021 is an equidigital number, since it uses as much as digits as its factorization.

70072021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 70072021 is about 8370.9032368078. The cubic root of 70072021 is about 412.2698239573.

Adding to 70072021 its reverse (12027007), we get a palindrome (82099028).

The spelling of 70072021 in words is "seventy million, seventy-two thousand, twenty-one".