126210520251 has 12 divisors (see below), whose sum is σ = 189056088312. Its totient is φ = 84140346672.

The previous prime is 126210520223. The next prime is 126210520253. The reversal of 126210520251 is 152025012621.

126210520251 is a `hidden beast` number, since 12 + 621 + 0 + 5 + 2 + 0 + 25 + 1 = 666.

It is not a de Polignac number, because 126210520251 - 2⁷ = 126210520123 is a prime.

It is a super-2 number, since 2×126210520251² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (126210520253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259692186 + ... + 259692671.

It is an arithmetic number, because the mean of its divisors is an integer number (15754674026).

Almost surely, 2^126210520251 is an apocalyptic number.

126210520251 is a deficient number, since it is larger than the sum of its proper divisors (62845568061).

126210520251 is an frugal number, since it uses more digits than its factorization.

126210520251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519384872 (or 519384860 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 126210520251 its reverse (152025012621), we get a palindrome (278235532872).

The spelling of 126210520251 in words is "one hundred twenty-six billion, two hundred ten million, five hundred twenty thousand, two hundred fifty-one".