20121165606251 has 8 divisors (see below), whose sum is σ = 20188539243840. Its totient is φ = 20053903608648.

The previous prime is 20121165606203. The next prime is 20121165606319. The reversal of 20121165606251 is 15260656112102.

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 20121165606251 - 2⁴² = 15723119095147 is a prime.

It is a super-2 number, since 2×20121165606251² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121165608251) 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, 27548921 + ... + 28269866.

It is an arithmetic number, because the mean of its divisors is an integer number (2523567405480).

Almost surely, 2^{20121165606251} is an apocalyptic number.

20121165606251 is a deficient number, since it is larger than the sum of its proper divisors (67373637589).

20121165606251 is an equidigital number, since it uses as much as digits as its factorization.

20121165606251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55819993.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 20121165606251 in words is "twenty trillion, one hundred twenty-one billion, one hundred sixty-five million, six hundred six thousand, two hundred fifty-one".