971202821 has 2 divisors, whose sum is σ = 971202822. Its totient is φ = 971202820.

The previous prime is 971202781. The next prime is 971202833. The reversal of 971202821 is 128202179.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 841812196 + 129390625 = 29014^2 + 11375^2 .

It is a cyclic number.

It is not a de Polignac number, because 971202821 - 2¹⁰ = 971201797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971202521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485601410 + 485601411.

It is an arithmetic number, because the mean of its divisors is an integer number (485601411).

Almost surely, 2^971202821 is an apocalyptic number.

It is an amenable number.

971202821 is a deficient number, since it is larger than the sum of its proper divisors (1).

971202821 is an equidigital number, since it uses as much as digits as its factorization.

971202821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 971202821 is about 31164.1271496572. The cubic root of 971202821 is about 990.3072953483.

The spelling of 971202821 in words is "nine hundred seventy-one million, two hundred two thousand, eight hundred twenty-one".