126221538720 has 96 divisors (see below), whose sum is σ = 418524079680. Its totient is φ = 31887544320.

The previous prime is 126221538673. The next prime is 126221538731. The reversal of 126221538720 is 27835122621.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6910921 + ... + 6929160.

It is an arithmetic number, because the mean of its divisors is an integer number (4359625830).

Almost surely, 2^126221538720 is an apocalyptic number.

126221538720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126221538720 is an abundant number, since it is smaller than the sum of its proper divisors (292302540960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126221538720 is a wasteful number, since it uses less digits than its factorization.

126221538720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13840118 (or 13840110 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 126221538720 in words is "one hundred twenty-six billion, two hundred twenty-one million, five hundred thirty-eight thousand, seven hundred twenty".