126204388981 has 32 divisors (see below), whose sum is σ = 145808087040. Its totient is φ = 108112276800.

The previous prime is 126204388967. The next prime is 126204388991. The reversal of 126204388981 is 189883402621.

It is not a de Polignac number, because 126204388981 - 2⁷ = 126204388853 is a prime.

It is a super-2 number, since 2×126204388981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126204388931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7530271 + ... + 7547011.

It is an arithmetic number, because the mean of its divisors is an integer number (4556502720).

Almost surely, 2^126204388981 is an apocalyptic number.

126204388981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126204388981 is a deficient number, since it is larger than the sum of its proper divisors (19603698059).

126204388981 is a wasteful number, since it uses less digits than its factorization.

126204388981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17217.

The product of its (nonzero) digits is 1327104, while the sum is 52.

The spelling of 126204388981 in words is "one hundred twenty-six billion, two hundred four million, three hundred eighty-eight thousand, nine hundred eighty-one".