21445002041451 has 32 divisors (see below), whose sum is σ = 28873450045440. Its totient is φ = 14157319822464.

The previous prime is 21445002041417. The next prime is 21445002041471. The reversal of 21445002041451 is 15414020054412.

It is not a de Polignac number, because 21445002041451 - 2³³ = 21436412106859 is a prime.

It is a super-2 number, since 2×21445002041451² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21445002041471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 747120166 + ... + 747148868.

It is an arithmetic number, because the mean of its divisors is an integer number (902295313920).

Almost surely, 2^{21445002041451} is an apocalyptic number.

21445002041451 is a deficient number, since it is larger than the sum of its proper divisors (7428448003989).

21445002041451 is a wasteful number, since it uses less digits than its factorization.

21445002041451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34795.

The product of its (nonzero) digits is 25600, while the sum is 33.

Adding to 21445002041451 its reverse (15414020054412), we get a palindrome (36859022095863).

The spelling of 21445002041451 in words is "twenty-one trillion, four hundred forty-five billion, two million, forty-one thousand, four hundred fifty-one".