21147068901 has 32 divisors (see below), whose sum is σ = 32345913600. Its totient is φ = 12038455296.

The previous prime is 21147068881. The next prime is 21147068933. The reversal of 21147068901 is 10986074112.

It is not a de Polignac number, because 21147068901 - 2⁵ = 21147068869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21147068901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21147068401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8079345 + ... + 8081961.

It is an arithmetic number, because the mean of its divisors is an integer number (1010809800).

Almost surely, 2^21147068901 is an apocalyptic number.

21147068901 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21147068901 is a deficient number, since it is larger than the sum of its proper divisors (11198844699).

21147068901 is a wasteful number, since it uses less digits than its factorization.

21147068901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3933.

The product of its (nonzero) digits is 24192, while the sum is 39.

The spelling of 21147068901 in words is "twenty-one billion, one hundred forty-seven million, sixty-eight thousand, nine hundred one".