21004151455005 has 16 divisors (see below), whose sum is σ = 33780770013120. Its totient is φ = 11144171547648.

The previous prime is 21004151454973. The next prime is 21004151455069. The reversal of 21004151455005 is 50055415140012.

It is a happy number.

It is not a de Polignac number, because 21004151455005 - 2⁵ = 21004151454973 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3627657115 + ... + 3627662904.

It is an arithmetic number, because the mean of its divisors is an integer number (2111298125820).

Almost surely, 2^{21004151455005} is an apocalyptic number.

It is an amenable number.

21004151455005 is a deficient number, since it is larger than the sum of its proper divisors (12776618558115).

21004151455005 is a wasteful number, since it uses less digits than its factorization.

21004151455005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7255320220.

The product of its (nonzero) digits is 20000, while the sum is 33.

Adding to 21004151455005 its reverse (50055415140012), we get a palindrome (71059566595017).

The spelling of 21004151455005 in words is "twenty-one trillion, four billion, one hundred fifty-one million, four hundred fifty-five thousand, five".