201621000547 has 4 divisors (see below), whose sum is σ = 207070216816. Its totient is φ = 196171784280.

The previous prime is 201621000541. The next prime is 201621000551. The reversal of 201621000547 is 745000126102.

201621000547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201621000547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201621000541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2724608079 + ... + 2724608152.

It is an arithmetic number, because the mean of its divisors is an integer number (51767554204).

Almost surely, 2^201621000547 is an apocalyptic number.

201621000547 is the 240013-rd centered heptagonal number.

201621000547 is a deficient number, since it is larger than the sum of its proper divisors (5449216269).

201621000547 is an equidigital number, since it uses as much as digits as its factorization.

201621000547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5449216268.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 201621000547 its reverse (745000126102), we get a palindrome (946621126649).

The spelling of 201621000547 in words is "two hundred one billion, six hundred twenty-one million, five hundred forty-seven", and thus it is an aban number.