21010232451 has 16 divisors (see below), whose sum is σ = 30870135296. Its totient is φ = 12628689696.

The previous prime is 21010232437. The next prime is 21010232479. The reversal of 21010232451 is 15423201012.

It is not a de Polignac number, because 21010232451 - 2¹⁷ = 21010101379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010232401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6262555 + ... + 6265908.

It is an arithmetic number, because the mean of its divisors is an integer number (1929383456).

Almost surely, 2^21010232451 is an apocalyptic number.

21010232451 is a deficient number, since it is larger than the sum of its proper divisors (9859902845).

21010232451 is a wasteful number, since it uses less digits than its factorization.

21010232451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12528522.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21010232451 its reverse (15423201012), we get a palindrome (36433433463).

The spelling of 21010232451 in words is "twenty-one billion, ten million, two hundred thirty-two thousand, four hundred fifty-one".