20104021215451 has 4 divisors (see below), whose sum is σ = 20104134029712. Its totient is φ = 20103908401192.

The previous prime is 20104021215373. The next prime is 20104021215521. The reversal of 20104021215451 is 15451212040102.

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 20104021215451 - 2¹⁵ = 20104021182683 is a prime.

It is a super-2 number, since 2×20104021215451² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20104021215851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56139400 + ... + 56496373.

It is an arithmetic number, because the mean of its divisors is an integer number (5026033507428).

Almost surely, 2^{20104021215451} is an apocalyptic number.

20104021215451 is a deficient number, since it is larger than the sum of its proper divisors (112814261).

20104021215451 is a wasteful number, since it uses less digits than its factorization.

20104021215451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112814260.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 20104021215451 its reverse (15451212040102), we get a palindrome (35555233255553).

The spelling of 20104021215451 in words is "twenty trillion, one hundred four billion, twenty-one million, two hundred fifteen thousand, four hundred fifty-one".