21050133501 has 4 divisors (see below), whose sum is σ = 28066844672. Its totient is φ = 14033422332.

The previous prime is 21050133443. The next prime is 21050133539. The reversal of 21050133501 is 10533105012.

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 not a de Polignac number, because 21050133501 - 2²⁹ = 20513262589 is a prime.

It is a super-6 number, since 6×21050133501⁶ (a number of 63 digits) contains 666666 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050133551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3508355581 + ... + 3508355586.

It is an arithmetic number, because the mean of its divisors is an integer number (7016711168).

Almost surely, 2^21050133501 is an apocalyptic number.

It is an amenable number.

21050133501 is a deficient number, since it is larger than the sum of its proper divisors (7016711171).

21050133501 is an equidigital number, since it uses as much as digits as its factorization.

21050133501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7016711170.

The product of its (nonzero) digits is 450, while the sum is 21.

Adding to 21050133501 its reverse (10533105012), we get a palindrome (31583238513).

The spelling of 21050133501 in words is "twenty-one billion, fifty million, one hundred thirty-three thousand, five hundred one".