20997001134251 has 8 divisors (see below), whose sum is σ = 21235779739440. Its totient is φ = 20758286023552.

The previous prime is 20997001134247. The next prime is 20997001134293. The reversal of 20997001134251 is 15243110079902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20997001134251 - 2² = 20997001134247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20997001134451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15208325 + ... + 16531398.

It is an arithmetic number, because the mean of its divisors is an integer number (2654472467430).

Almost surely, 2^{20997001134251} is an apocalyptic number.

20997001134251 is a deficient number, since it is larger than the sum of its proper divisors (238778605189).

20997001134251 is an equidigital number, since it uses as much as digits as its factorization.

20997001134251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31747245.

The product of its (nonzero) digits is 136080, while the sum is 44.

The spelling of 20997001134251 in words is "twenty trillion, nine hundred ninety-seven billion, one million, one hundred thirty-four thousand, two hundred fifty-one".