21201100993 has 8 divisors (see below), whose sum is σ = 21763577600. Its totient is φ = 20645977248.

The previous prime is 21201100967. The next prime is 21201101003. The reversal of 21201100993 is 39900110212.

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 21201100993 - 2¹⁷ = 21200969921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201100493) 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, 1832373 + ... + 1843906.

It is an arithmetic number, because the mean of its divisors is an integer number (2720447200).

Almost surely, 2^21201100993 is an apocalyptic number.

It is an amenable number.

21201100993 is a deficient number, since it is larger than the sum of its proper divisors (562476607).

21201100993 is an equidigital number, since it uses as much as digits as its factorization.

21201100993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3676431.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 21201100993 in words is "twenty-one billion, two hundred one million, one hundred thousand, nine hundred ninety-three".