2021541397 has 4 divisors (see below), whose sum is σ = 2032710316. Its totient is φ = 2010372480.

The previous prime is 2021541373. The next prime is 2021541419. The reversal of 2021541397 is 7931451202.

It is a happy number.

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 151930276 + 1869611121 = 12326^2 + 43239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021541397 - 2¹⁹ = 2021017109 is a prime.

It is a super-3 number, since 3×2021541397³ (a number of 29 digits) contains 333 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 (2021541497) 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, 5584188 + ... + 5584549.

It is an arithmetic number, because the mean of its divisors is an integer number (508177579).

Almost surely, 2^2021541397 is an apocalyptic number.

It is an amenable number.

2021541397 is a deficient number, since it is larger than the sum of its proper divisors (11168919).

2021541397 is a wasteful number, since it uses less digits than its factorization.

2021541397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11168918.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 2021541397 is about 44961.5546550606. The cubic root of 2021541397 is about 1264.4283162047.

Adding to 2021541397 its reverse (7931451202), we get a palindrome (9952992599).

The spelling of 2021541397 in words is "two billion, twenty-one million, five hundred forty-one thousand, three hundred ninety-seven".