21454450151415 has 48 divisors (see below), whose sum is σ = 36528343649952. Its totient is φ = 10750627086336.

The previous prime is 21454450151401. The next prime is 21454450151489. The reversal of 21454450151415 is 51415105445412.

It is not a de Polignac number, because 21454450151415 - 2⁵ = 21454450151383 is a prime.

It is a super-2 number, since 2×21454450151415² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1787374 + ... + 6789963.

It is an arithmetic number, because the mean of its divisors is an integer number (761007159374).

Almost surely, 2^{21454450151415} is an apocalyptic number.

21454450151415 is a deficient number, since it is larger than the sum of its proper divisors (15073893498537).

21454450151415 is a wasteful number, since it uses less digits than its factorization.

21454450151415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8577956 (or 8577939 counting only the distinct ones).

The product of its (nonzero) digits is 320000, while the sum is 42.

Adding to 21454450151415 its reverse (51415105445412), we get a palindrome (72869555596827).

The spelling of 21454450151415 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred fifty million, one hundred fifty-one thousand, four hundred fifteen".