2140451021 has 4 divisors (see below), whose sum is σ = 2175540444. Its totient is φ = 2105361600.

The previous prime is 2140451003. The next prime is 2140451039. The reversal of 2140451021 is 1201540412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2140451003) and next prime (2140451039).

It can be written as a sum of positive squares in 2 ways, for example, as 440538121 + 1699912900 = 20989^2 + 41230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140451021 - 2¹⁸ = 2140188877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2140450984 and 2140451002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140451041) 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, 17544620 + ... + 17544741.

It is an arithmetic number, because the mean of its divisors is an integer number (543885111).

Almost surely, 2^2140451021 is an apocalyptic number.

It is an amenable number.

2140451021 is a deficient number, since it is larger than the sum of its proper divisors (35089423).

2140451021 is an equidigital number, since it uses as much as digits as its factorization.

2140451021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35089422.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2140451021 is about 46265.0086026146. The cubic root of 2140451021 is about 1288.7492676711.

Adding to 2140451021 its reverse (1201540412), we get a palindrome (3341991433).

The spelling of 2140451021 in words is "two billion, one hundred forty million, four hundred fifty-one thousand, twenty-one".