11020231997 has 8 divisors (see below), whose sum is σ = 11669519736. Its totient is φ = 10371059712.

The previous prime is 11020231991. The next prime is 11020232021. The reversal of 11020231997 is 79913202011.

It can be written as a sum of positive squares in 4 ways, for example, as 1136094436 + 9884137561 = 33706^2 + 99419^2 .

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

It is not a de Polignac number, because 11020231997 - 2²⁰ = 11019183421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11020231991) 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, 238493 + ... + 280925.

It is an arithmetic number, because the mean of its divisors is an integer number (1458689967).

Almost surely, 2^11020231997 is an apocalyptic number.

11020231997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11020231997 is a deficient number, since it is larger than the sum of its proper divisors (649287739).

11020231997 is a wasteful number, since it uses less digits than its factorization.

11020231997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57727.

The product of its (nonzero) digits is 6804, while the sum is 35.

The spelling of 11020231997 in words is "eleven billion, twenty million, two hundred thirty-one thousand, nine hundred ninety-seven".