21005245301 has 8 divisors (see below), whose sum is σ = 21093446304. Its totient is φ = 20917157200.

The previous prime is 21005245297. The next prime is 21005245307. The reversal of 21005245301 is 10354250012.

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 21005245301 - 2² = 21005245297 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21005245307) 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, 355526 + ... + 410376.

It is an arithmetic number, because the mean of its divisors is an integer number (2636680788).

Almost surely, 2^21005245301 is an apocalyptic number.

It is an amenable number.

21005245301 is a deficient number, since it is larger than the sum of its proper divisors (88201003).

21005245301 is a wasteful number, since it uses less digits than its factorization.

21005245301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56451.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21005245301 its reverse (10354250012), we get a palindrome (31359495313).

The spelling of 21005245301 in words is "twenty-one billion, five million, two hundred forty-five thousand, three hundred one".