126999821505 has 8 divisors (see below), whose sum is σ = 203199714432. Its totient is φ = 67733238128.

The previous prime is 126999821479. The next prime is 126999821513. The reversal of 126999821505 is 505128999621.

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 126999821505 - 2²⁴ = 126983044289 is a prime.

It is a super-2 number, since 2×126999821505² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4233327369 + ... + 4233327398.

It is an arithmetic number, because the mean of its divisors is an integer number (25399964304).

Almost surely, 2^126999821505 is an apocalyptic number.

126999821505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126999821505 is a deficient number, since it is larger than the sum of its proper divisors (76199892927).

126999821505 is an equidigital number, since it uses as much as digits as its factorization.

126999821505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8466654775.

The product of its (nonzero) digits is 3499200, while the sum is 57.

The spelling of 126999821505 in words is "one hundred twenty-six billion, nine hundred ninety-nine million, eight hundred twenty-one thousand, five hundred five".