21454450151357 has 2 divisors, whose sum is σ = 21454450151358. Its totient is φ = 21454450151356.

The previous prime is 21454450151327. The next prime is 21454450151369. The reversal of 21454450151357 is 75315105445412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12967914007801 + 8486536143556 = 3601099^2 + 2913166^2 .

It is a cyclic number.

It is not a de Polignac number, because 21454450151357 - 2¹⁴ = 21454450134973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21454450151327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727225075678 + 10727225075679.

It is an arithmetic number, because the mean of its divisors is an integer number (10727225075679).

Almost surely, 2^{21454450151357} is an apocalyptic number.

It is an amenable number.

21454450151357 is a deficient number, since it is larger than the sum of its proper divisors (1).

21454450151357 is an equidigital number, since it uses as much as digits as its factorization.

21454450151357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680000, while the sum is 47.

Adding to 21454450151357 its reverse (75315105445412), we get a palindrome (96769555596769).

The spelling of 21454450151357 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred fifty million, one hundred fifty-one thousand, three hundred fifty-seven".