21012301501 has 4 divisors (see below), whose sum is σ = 21072856032. Its totient is φ = 20951746972.

The previous prime is 21012301469. The next prime is 21012301573. The reversal of 21012301501 is 10510321012.

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 21012301501 - 2⁵ = 21012301469 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 (21013301501) 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, 30276745 + ... + 30277438.

It is an arithmetic number, because the mean of its divisors is an integer number (5268214008).

Almost surely, 2^21012301501 is an apocalyptic number.

It is an amenable number.

21012301501 is a deficient number, since it is larger than the sum of its proper divisors (60554531).

21012301501 is an equidigital number, since it uses as much as digits as its factorization.

21012301501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60554530.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 21012301501 its reverse (10510321012), we get a palindrome (31522622513).

The spelling of 21012301501 in words is "twenty-one billion, twelve million, three hundred one thousand, five hundred one".