2171189156401 has 4 divisors (see below), whose sum is σ = 2191480643952. Its totient is φ = 2150897668852.

The previous prime is 2171189156363. The next prime is 2171189156447. The reversal of 2171189156401 is 1046519811712.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2171189156401 - 2⁷ = 2171189156273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171189156491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10145743615 + ... + 10145743828.

It is an arithmetic number, because the mean of its divisors is an integer number (547870160988).

Almost surely, 2^{2171189156401} is an apocalyptic number.

It is an amenable number.

2171189156401 is a deficient number, since it is larger than the sum of its proper divisors (20291487551).

2171189156401 is a wasteful number, since it uses less digits than its factorization.

2171189156401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20291487550.

The product of its (nonzero) digits is 120960, while the sum is 46.

The spelling of 2171189156401 in words is "two trillion, one hundred seventy-one billion, one hundred eighty-nine million, one hundred fifty-six thousand, four hundred one".