921052081 has 4 divisors (see below), whose sum is σ = 921130992. Its totient is φ = 920973172.

The previous prime is 921052051. The next prime is 921052103. The reversal of 921052081 is 180250129.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 180250129 = 3119 ⋅57791.

It is a cyclic number.

It is not a de Polignac number, because 921052081 - 2¹¹ = 921050033 is a prime.

It is a super-2 number, since 2×921052081² = 1696673871828861122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921052021) 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, 18091 + ... + 46576.

It is an arithmetic number, because the mean of its divisors is an integer number (230282748).

Almost surely, 2^921052081 is an apocalyptic number.

It is an amenable number.

921052081 is a deficient number, since it is larger than the sum of its proper divisors (78911).

921052081 is a wasteful number, since it uses less digits than its factorization.

921052081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78910.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 921052081 is about 30348.8398625055. The cubic root of 921052081 is about 972.9594249232.

The spelling of 921052081 in words is "nine hundred twenty-one million, fifty-two thousand, eighty-one".