21601620706254 has 8 divisors (see below), whose sum is σ = 43203241412520. Its totient is φ = 7200540235416.

The previous prime is 21601620706189. The next prime is 21601620706291. The reversal of 21601620706254 is 45260702610612.

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

21601620706254 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800135058849 + ... + 1800135058860.

It is an arithmetic number, because the mean of its divisors is an integer number (5400405176565).

Almost surely, 2^{21601620706254} is an apocalyptic number.

21601620706254 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21601620706254 is a wasteful number, since it uses less digits than its factorization.

21601620706254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600270117714.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 21601620706254 in words is "twenty-one trillion, six hundred one billion, six hundred twenty million, seven hundred six thousand, two hundred fifty-four".