21407000542171 has 16 divisors (see below), whose sum is σ = 21937966991136. Its totient is φ = 20880750981376.

The previous prime is 21407000542139. The next prime is 21407000542201. The reversal of 21407000542171 is 17124500070412.

It is a cyclic number.

It is not a de Polignac number, because 21407000542171 - 2⁵ = 21407000542139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21407000542111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293399031 + ... + 293471983.

It is an arithmetic number, because the mean of its divisors is an integer number (1371122936946).

Almost surely, 2^{21407000542171} is an apocalyptic number.

21407000542171 is a deficient number, since it is larger than the sum of its proper divisors (530966448965).

21407000542171 is a wasteful number, since it uses less digits than its factorization.

21407000542171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105182.

The product of its (nonzero) digits is 15680, while the sum is 34.

The spelling of 21407000542171 in words is "twenty-one trillion, four hundred seven billion, five hundred forty-two thousand, one hundred seventy-one".