21010140451 has 4 divisors (see below), whose sum is σ = 21037462600. Its totient is φ = 20982818304.

The previous prime is 21010140449. The next prime is 21010140461. The reversal of 21010140451 is 15404101012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010140451 - 2¹ = 21010140449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010140461) 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, 13659921 + ... + 13661458.

It is an arithmetic number, because the mean of its divisors is an integer number (5259365650).

Almost surely, 2^21010140451 is an apocalyptic number.

21010140451 is a deficient number, since it is larger than the sum of its proper divisors (27322149).

21010140451 is an equidigital number, since it uses as much as digits as its factorization.

21010140451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27322148.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 21010140451 its reverse (15404101012), we get a palindrome (36414241463).

The spelling of 21010140451 in words is "twenty-one billion, ten million, one hundred forty thousand, four hundred fifty-one".