126600642421 has 24 divisors (see below), whose sum is σ = 152094765312. Its totient is φ = 104827113600.

The previous prime is 126600642419. The next prime is 126600642449. The reversal of 126600642421 is 124246006621.

It is not a de Polignac number, because 126600642421 - 2¹ = 126600642419 is a prime.

It is a super-2 number, since 2×126600642421² (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 (126600642121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 928915 + ... + 1056448.

It is an arithmetic number, because the mean of its divisors is an integer number (6337281888).

Almost surely, 2^126600642421 is an apocalyptic number.

126600642421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126600642421 is a deficient number, since it is larger than the sum of its proper divisors (25494122891).

126600642421 is a wasteful number, since it uses less digits than its factorization.

126600642421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985433 (or 1985422 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 126600642421 in words is "one hundred twenty-six billion, six hundred million, six hundred forty-two thousand, four hundred twenty-one".