20421145410454 has 16 divisors (see below), whose sum is σ = 32253628953600. Its totient is φ = 9670259597544.

The previous prime is 20421145410439. The next prime is 20421145410517. The reversal of 20421145410454 is 45401454112402.

It is a super-2 number, since 2×20421145410454² (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 7 ways as a sum of consecutive naturals, for example, 80831782 + ... + 81084025.

It is an arithmetic number, because the mean of its divisors is an integer number (2015851809600).

Almost surely, 2^{20421145410454} is an apocalyptic number.

20421145410454 is a deficient number, since it is larger than the sum of its proper divisors (11832483543146).

20421145410454 is a wasteful number, since it uses less digits than its factorization.

20421145410454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161919147.

The product of its (nonzero) digits is 102400, while the sum is 37.

Adding to 20421145410454 its reverse (45401454112402), we get a palindrome (65822599522856).

The spelling of 20421145410454 in words is "twenty trillion, four hundred twenty-one billion, one hundred forty-five million, four hundred ten thousand, four hundred fifty-four".