21221012101985 has 8 divisors (see below), whose sum is σ = 25571763538560. Its totient is φ = 16905777004144.

The previous prime is 21221012101967. The next prime is 21221012101997. The reversal of 21221012101985 is 58910121012212.

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 21221012101985 - 2¹⁰ = 21221012100961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8879083367 + ... + 8879085756.

It is an arithmetic number, because the mean of its divisors is an integer number (3196470442320).

Almost surely, 2^{21221012101985} is an apocalyptic number.

It is an amenable number.

21221012101985 is a deficient number, since it is larger than the sum of its proper divisors (4350751436575).

21221012101985 is a wasteful number, since it uses less digits than its factorization.

21221012101985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17758169367.

The product of its (nonzero) digits is 5760, while the sum is 35.

The spelling of 21221012101985 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred one thousand, nine hundred eighty-five".