126621201 has 32 divisors (see below), whose sum is σ = 197244928. Its totient is φ = 70761600.

The previous prime is 126621179. The next prime is 126621203. The reversal of 126621201 is 102126621.

It is not a de Polignac number, because 126621201 - 2⁵ = 126621169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126621203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231210 + ... + 231756.

It is an arithmetic number, because the mean of its divisors is an integer number (6163904).

Almost surely, 2^126621201 is an apocalyptic number.

It is an amenable number.

126621201 is a deficient number, since it is larger than the sum of its proper divisors (70623727).

126621201 is a wasteful number, since it uses less digits than its factorization.

126621201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 126621201 is about 11252.6086308909. The cubic root of 126621201 is about 502.1523230501.

Adding to 126621201 its reverse (102126621), we get a palindrome (228747822).

The spelling of 126621201 in words is "one hundred twenty-six million, six hundred twenty-one thousand, two hundred one".