21250246122251 has 8 divisors (see below), whose sum is σ = 21643212571200. Its totient is φ = 20858372766280.

The previous prime is 21250246122247. The next prime is 21250246122299. The reversal of 21250246122251 is 15222164205212.

It is a happy number.

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 21250246122251 - 2² = 21250246122247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21250246122221) 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, 273234005 + ... + 273311766.

It is an arithmetic number, because the mean of its divisors is an integer number (2705401571400).

Almost surely, 2^{21250246122251} is an apocalyptic number.

21250246122251 is a deficient number, since it is larger than the sum of its proper divisors (392966448949).

21250246122251 is an equidigital number, since it uses as much as digits as its factorization.

21250246122251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546546489.

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 21250246122251 in words is "twenty-one trillion, two hundred fifty billion, two hundred forty-six million, one hundred twenty-two thousand, two hundred fifty-one".