21454450151291 has 4 divisors (see below), whose sum is σ = 21462860365584. Its totient is φ = 21446039937000.

The previous prime is 21454450151273. The next prime is 21454450151297. The reversal of 21454450151291 is 19215105445412.

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 21454450151291 - 2¹⁴ = 21454450134907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454450151297) 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, 4205103320 + ... + 4205108421.

It is an arithmetic number, because the mean of its divisors is an integer number (5365715091396).

Almost surely, 2^{21454450151291} is an apocalyptic number.

21454450151291 is a deficient number, since it is larger than the sum of its proper divisors (8410214293).

21454450151291 is an equidigital number, since it uses as much as digits as its factorization.

21454450151291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8410214292.

The product of its (nonzero) digits is 288000, while the sum is 44.

The spelling of 21454450151291 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred fifty million, one hundred fifty-one thousand, two hundred ninety-one".