21041013244251 has 32 divisors (see below), whose sum is σ = 37667827911168. Its totient is φ = 10089596759040.

The previous prime is 21041013244231. The next prime is 21041013244267. The reversal of 21041013244251 is 15244231014012.

It is not a de Polignac number, because 21041013244251 - 2⁶ = 21041013244187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21041013244231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3503329206 + ... + 3503335211.

It is an arithmetic number, because the mean of its divisors is an integer number (1177119622224).

Almost surely, 2^{21041013244251} is an apocalyptic number.

21041013244251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21041013244251 is a deficient number, since it is larger than the sum of its proper divisors (16626814666917).

21041013244251 is a wasteful number, since it uses less digits than its factorization.

21041013244251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006664451.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 21041013244251 its reverse (15244231014012), we get a palindrome (36285244258263).

The spelling of 21041013244251 in words is "twenty-one trillion, forty-one billion, thirteen million, two hundred forty-four thousand, two hundred fifty-one".