2021253137 has 4 divisors (see below), whose sum is σ = 2070552036. Its totient is φ = 1971954240.

The previous prime is 2021253077. The next prime is 2021253161. The reversal of 2021253137 is 7313521202.

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 380679121 + 1640574016 = 19511^2 + 40504^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021253137 - 2⁸ = 2021252881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021253737) 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, 24649388 + ... + 24649469.

It is an arithmetic number, because the mean of its divisors is an integer number (517638009).

Almost surely, 2^2021253137 is an apocalyptic number.

It is an amenable number.

2021253137 is a deficient number, since it is larger than the sum of its proper divisors (49298899).

2021253137 is an equidigital number, since it uses as much as digits as its factorization.

2021253137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49298898.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 2021253137 is about 44958.3489131885. The cubic root of 2021253137 is about 1264.3682133161.

Adding to 2021253137 its reverse (7313521202), we get a palindrome (9334774339).

The spelling of 2021253137 in words is "two billion, twenty-one million, two hundred fifty-three thousand, one hundred thirty-seven".