21001553250301 has 8 divisors (see below), whose sum is σ = 22663498949504. Its totient is φ = 19346242065840.

The previous prime is 21001553250257. The next prime is 21001553250343. The reversal of 21001553250301 is 10305235510012.

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 21001553250301 - 2¹⁹ = 21001552726013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21001553250301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001553250361) 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, 1658622105 + ... + 1658634766.

It is an arithmetic number, because the mean of its divisors is an integer number (2832937368688).

Almost surely, 2^{21001553250301} is an apocalyptic number.

It is an amenable number.

21001553250301 is a deficient number, since it is larger than the sum of its proper divisors (1661945699203).

21001553250301 is a wasteful number, since it uses less digits than its factorization.

21001553250301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317257371.

The product of its (nonzero) digits is 4500, while the sum is 28.

Adding to 21001553250301 its reverse (10305235510012), we get a palindrome (31306788760313).

The spelling of 21001553250301 in words is "twenty-one trillion, one billion, five hundred fifty-three million, two hundred fifty thousand, three hundred one".