7472020021 has 2 divisors, whose sum is σ = 7472020022. Its totient is φ = 7472020020.

The previous prime is 7472019983. The next prime is 7472020057. The reversal of 7472020021 is 1200202747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6429634225 + 1042385796 = 80185^2 + 32286^2 .

It is an emirp because it is prime and its reverse (1200202747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7472020021 - 2¹³ = 7472011829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7472021021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3736010010 + 3736010011.

It is an arithmetic number, because the mean of its divisors is an integer number (3736010011).

Almost surely, 2^7472020021 is an apocalyptic number.

It is an amenable number.

7472020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7472020021 is an equidigital number, since it uses as much as digits as its factorization.

7472020021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 7472020021 is about 86440.8469474935. The cubic root of 7472020021 is about 1954.9966113890.

Adding to 7472020021 its reverse (1200202747), we get a palindrome (8672222768).

The spelling of 7472020021 in words is "seven billion, four hundred seventy-two million, twenty thousand, twenty-one".