21251454141 has 16 divisors (see below), whose sum is σ = 29765692800. Its totient is φ = 13460694720.

The previous prime is 21251454089. The next prime is 21251454181. The reversal of 21251454141 is 14145415212.

It is a de Polignac number, because none of the positive numbers 2^k-21251454141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21251454099 and 21251454108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21251454181) 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, 1023250 + ... + 1043811.

It is an arithmetic number, because the mean of its divisors is an integer number (1860355800).

Almost surely, 2^21251454141 is an apocalyptic number.

It is an amenable number.

21251454141 is a deficient number, since it is larger than the sum of its proper divisors (8514238659).

21251454141 is a wasteful number, since it uses less digits than its factorization.

21251454141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067236.

The product of its digits is 6400, while the sum is 30.

Adding to 21251454141 its reverse (14145415212), we get a palindrome (35396869353).

The spelling of 21251454141 in words is "twenty-one billion, two hundred fifty-one million, four hundred fifty-four thousand, one hundred forty-one".