126631204641721 has 16 divisors (see below), whose sum is σ = 136534543625536. Its totient is φ = 116751081917376.

The previous prime is 126631204641701. The next prime is 126631204641731. The reversal of 126631204641721 is 127146402136621.

It is a cyclic number.

It is not a de Polignac number, because 126631204641721 - 2¹³ = 126631204633529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126631204641701) 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, 975800386 + ... + 975930148.

It is an arithmetic number, because the mean of its divisors is an integer number (8533408976596).

Almost surely, 2^{126631204641721} is an apocalyptic number.

It is an amenable number.

126631204641721 is a deficient number, since it is larger than the sum of its proper divisors (9903338983815).

126631204641721 is a wasteful number, since it uses less digits than its factorization.

126631204641721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218632.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 126631204641721 in words is "one hundred twenty-six trillion, six hundred thirty-one billion, two hundred four million, six hundred forty-one thousand, seven hundred twenty-one".