126254242521 has 12 divisors (see below), whose sum is σ = 198946079280. Its totient is φ = 76517722680.

The previous prime is 126254242519. The next prime is 126254242523. The reversal of 126254242521 is 125242452621.

126254242521 is a `hidden beast` number, since 1 + 2 + 62 + 54 + 24 + 2 + 521 = 666.

It is an interprime number because it is at equal distance from previous prime (126254242519) and next prime (126254242523).

It is not a de Polignac number, because 126254242521 - 2¹ = 126254242519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (126254242523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 637647591 + ... + 637647788.

It is an arithmetic number, because the mean of its divisors is an integer number (16578839940).

Almost surely, 2^126254242521 is an apocalyptic number.

126254242521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126254242521 is a deficient number, since it is larger than the sum of its proper divisors (72691836759).

126254242521 is a wasteful number, since it uses less digits than its factorization.

126254242521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275295396 (or 1275295393 counting only the distinct ones).

The product of its digits is 76800, while the sum is 36.

The spelling of 126254242521 in words is "one hundred twenty-six billion, two hundred fifty-four million, two hundred forty-two thousand, five hundred twenty-one".