12021871951 has 8 divisors (see below), whose sum is σ = 12411907200. Its totient is φ = 11631976320.

The previous prime is 12021871937. The next prime is 12021871991. The reversal of 12021871951 is 15917812021.

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

It is a cyclic number.

It is not a de Polignac number, because 12021871951 - 2¹¹ = 12021869903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12021871951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021871991) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 156915 + ... + 220603.

It is an arithmetic number, because the mean of its divisors is an integer number (1551488400).

Almost surely, 2^12021871951 is an apocalyptic number.

12021871951 is a deficient number, since it is larger than the sum of its proper divisors (390035249).

12021871951 is an equidigital number, since it uses as much as digits as its factorization.

12021871951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69809.

The product of its (nonzero) digits is 10080, while the sum is 37.

The spelling of 12021871951 in words is "twelve billion, twenty-one million, eight hundred seventy-one thousand, nine hundred fifty-one".