21455450302451 has 4 divisors (see below), whose sum is σ = 23405945784504. Its totient is φ = 19504954820400.

The previous prime is 21455450302439. The next prime is 21455450302471. The reversal of 21455450302451 is 15420305455412.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21455450302451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21455450302399 and 21455450302408.

It is not an unprimeable number, because it can be changed into a prime (21455450302421) 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, 975247741010 + ... + 975247741031.

It is an arithmetic number, because the mean of its divisors is an integer number (5851486446126).

Almost surely, 2^{21455450302451} is an apocalyptic number.

21455450302451 is a deficient number, since it is larger than the sum of its proper divisors (1950495482053).

21455450302451 is a wasteful number, since it uses less digits than its factorization.

21455450302451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1950495482052.

The product of its (nonzero) digits is 480000, while the sum is 41.

Adding to 21455450302451 its reverse (15420305455412), we get a palindrome (36875755757863).

The spelling of 21455450302451 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred fifty million, three hundred two thousand, four hundred fifty-one".