126821087 has 4 divisors (see below), whose sum is σ = 129519456. Its totient is φ = 124122720.

The previous prime is 126821063. The next prime is 126821099. The reversal of 126821087 is 780128621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126821087 - 2²⁶ = 59712223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126821587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1349114 + ... + 1349207.

It is an arithmetic number, because the mean of its divisors is an integer number (32379864).

Almost surely, 2^126821087 is an apocalyptic number.

126821087 is a deficient number, since it is larger than the sum of its proper divisors (2698369).

126821087 is an equidigital number, since it uses as much as digits as its factorization.

126821087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698368.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 126821087 is about 11261.4868911703. The cubic root of 126821087 is about 502.4164190253.

The spelling of 126821087 in words is "one hundred twenty-six million, eight hundred twenty-one thousand, eighty-seven".