9972121526 has 8 divisors (see below), whose sum is σ = 15362457600. Its totient is φ = 4851302328.

The previous prime is 9972121517. The next prime is 9972121567. The reversal of 9972121526 is 6251212799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 67379126 + ... + 67379273.

It is an arithmetic number, because the mean of its divisors is an integer number (1920307200).

Almost surely, 2^9972121526 is an apocalyptic number.

9972121526 is a deficient number, since it is larger than the sum of its proper divisors (5390336074).

9972121526 is a wasteful number, since it uses less digits than its factorization.

9972121526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134758438.

The product of its digits is 136080, while the sum is 44.

The square root of 9972121526 is about 99860.5103431782. The cubic root of 9972121526 is about 2152.4307482656.

The spelling of 9972121526 in words is "nine billion, nine hundred seventy-two million, one hundred twenty-one thousand, five hundred twenty-six".