21533533450201 has 4 divisors (see below), whose sum is σ = 21550008993552. Its totient is φ = 21517057906852.

The previous prime is 21533533450103. The next prime is 21533533450213. The reversal of 21533533450201 is 10205433533512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21533533450201 - 2¹³ = 21533533442009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21533533457201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8237769715 + ... + 8237772328.

It is an arithmetic number, because the mean of its divisors is an integer number (5387502248388).

Almost surely, 2^{21533533450201} is an apocalyptic number.

It is an amenable number.

21533533450201 is a deficient number, since it is larger than the sum of its proper divisors (16475543351).

21533533450201 is a wasteful number, since it uses less digits than its factorization.

21533533450201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16475543350.

The product of its (nonzero) digits is 162000, while the sum is 37.

Adding to 21533533450201 its reverse (10205433533512), we get a palindrome (31738966983713).

The spelling of 21533533450201 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred thirty-three million, four hundred fifty thousand, two hundred one".