9122020021 has 4 divisors (see below), whose sum is σ = 9658609452. Its totient is φ = 8585430592.

The previous prime is 9122020007. The next prime is 9122020049. The reversal of 9122020021 is 1200202219.

9122020021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7759671921 + 1362348100 = 88089^2 + 36910^2 .

It is a cyclic number.

It is not a de Polignac number, because 9122020021 - 2⁹ = 9122019509 is a prime.

It is a super-2 number, since 2×9122020021² (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 (9122020091) 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, 268294690 + ... + 268294723.

It is an arithmetic number, because the mean of its divisors is an integer number (2414652363).

Almost surely, 2^9122020021 is an apocalyptic number.

It is an amenable number.

9122020021 is a deficient number, since it is larger than the sum of its proper divisors (536589431).

9122020021 is a wasteful number, since it uses less digits than its factorization.

9122020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536589430.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 9122020021 is about 95509.2666760666. The cubic root of 9122020021 is about 2089.4420968384.

The spelling of 9122020021 in words is "nine billion, one hundred twenty-two million, twenty thousand, twenty-one".