2171726901 has 12 divisors (see below), whose sum is σ = 3138439980. Its totient is φ = 1447125120.

The previous prime is 2171726849. The next prime is 2171726939. The reversal of 2171726901 is 1096271712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 529046001 + 1642680900 = 23001^2 + 40530^2 .

It is not a de Polignac number, because 2171726901 - 2¹¹ = 2171724853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171726701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37510 + ... + 75831.

It is an arithmetic number, because the mean of its divisors is an integer number (261536665).

Almost surely, 2^2171726901 is an apocalyptic number.

It is an amenable number.

2171726901 is a deficient number, since it is larger than the sum of its proper divisors (966713079).

2171726901 is a wasteful number, since it uses less digits than its factorization.

2171726901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115476 (or 115473 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 2171726901 is about 46601.7907488543. The cubic root of 2171726901 is about 1294.9959304792.

The spelling of 2171726901 in words is "two billion, one hundred seventy-one million, seven hundred twenty-six thousand, nine hundred one".