21201968841 has 8 divisors (see below), whose sum is σ = 28586924640. Its totient is φ = 13975829472.

The previous prime is 21201968839. The next prime is 21201968861. The reversal of 21201968841 is 14886910212.

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

It is not a de Polignac number, because 21201968841 - 2¹ = 21201968839 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21201968793 and 21201968802.

It is not an unprimeable number, because it can be changed into a prime (21201968861) 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, 39703795 + ... + 39704328.

It is an arithmetic number, because the mean of its divisors is an integer number (3573365580).

Almost surely, 2^21201968841 is an apocalyptic number.

It is an amenable number.

21201968841 is a deficient number, since it is larger than the sum of its proper divisors (7384955799).

21201968841 is an equidigital number, since it uses as much as digits as its factorization.

21201968841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79408215.

The product of its (nonzero) digits is 55296, while the sum is 42.

The spelling of 21201968841 in words is "twenty-one billion, two hundred one million, nine hundred sixty-eight thousand, eight hundred forty-one".