7822001021 has 4 divisors (see below), whose sum is σ = 8033406492. Its totient is φ = 7610595552.

The previous prime is 7822000987. The next prime is 7822001029. The reversal of 7822001021 is 1201002287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5862964900 + 1959036121 = 76570^2 + 44261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7822001021 is a prime.

It is a super-2 number, since 2×7822001021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7822001029) 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, 105702680 + ... + 105702753.

It is an arithmetic number, because the mean of its divisors is an integer number (2008351623).

Almost surely, 2^7822001021 is an apocalyptic number.

It is an amenable number.

7822001021 is a deficient number, since it is larger than the sum of its proper divisors (211405471).

7822001021 is a wasteful number, since it uses less digits than its factorization.

7822001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211405470.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 7822001021 is about 88442.0772087585. The cubic root of 7822001021 is about 1985.0553587464.

The spelling of 7822001021 in words is "seven billion, eight hundred twenty-two million, one thousand, twenty-one".