21155003452401 has 128 divisors (see below), whose sum is σ = 36798044774400. Its totient is φ = 10508519024640.

The previous prime is 21155003452381. The next prime is 21155003452489. The reversal of 21155003452401 is 10425430055112.

It is not a de Polignac number, because 21155003452401 - 2¹⁸ = 21155003190257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21155003432401) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2615923180 + ... + 2615931266.

It is an arithmetic number, because the mean of its divisors is an integer number (287484724800).

Almost surely, 2^{21155003452401} is an apocalyptic number.

21155003452401 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21155003452401 is a deficient number, since it is larger than the sum of its proper divisors (15643041321999).

21155003452401 is a wasteful number, since it uses less digits than its factorization.

21155003452401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16239.

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 21155003452401 in words is "twenty-one trillion, one hundred fifty-five billion, three million, four hundred fifty-two thousand, four hundred one".