2021111357 has 4 divisors (see below), whose sum is σ = 2021202720. Its totient is φ = 2021019996.

The previous prime is 2021111311. The next prime is 2021111399. The reversal of 2021111357 is 7531111202.

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.

It is a cyclic number.

It is not a de Polignac number, because 2021111357 - 2¹⁸ = 2020849213 is a prime.

It is a super-2 number, since 2×2021111357² = 8169782234788762898, which 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 (2021111957) 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, 10688 + ... + 64470.

It is an arithmetic number, because the mean of its divisors is an integer number (505300680).

Almost surely, 2^2021111357 is an apocalyptic number.

It is an amenable number.

2021111357 is a deficient number, since it is larger than the sum of its proper divisors (91363).

2021111357 is an equidigital number, since it uses as much as digits as its factorization.

2021111357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91362.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 2021111357 is about 44956.7720927559. The cubic root of 2021111357 is about 1264.3386497558.

Adding to 2021111357 its reverse (7531111202), we get a palindrome (9552222559).

The spelling of 2021111357 in words is "two billion, twenty-one million, one hundred eleven thousand, three hundred fifty-seven".