90241021 has 8 divisors (see below), whose sum is σ = 98776664. Its totient is φ = 81933120.

The previous prime is 90241007. The next prime is 90241061. The reversal of 90241021 is 12014209.

It can be written as a sum of positive squares in 4 ways, for example, as 5692996 + 84548025 = 2386^2 + 9195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90241021 - 2¹⁷ = 90109949 is a prime.

It is a super-2 number, since 2×90241021² = 16286883742244882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90241021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90241001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56106 + ... + 57691.

It is an arithmetic number, because the mean of its divisors is an integer number (12347083).

Almost surely, 2^90241021 is an apocalyptic number.

It is an amenable number.

90241021 is a deficient number, since it is larger than the sum of its proper divisors (8535643).

90241021 is a wasteful number, since it uses less digits than its factorization.

90241021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113871.

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

The square root of 90241021 is about 9499.5274092978. The cubic root of 90241021 is about 448.5401598042.

The spelling of 90241021 in words is "ninety million, two hundred forty-one thousand, twenty-one".