21530353003015 has 16 divisors (see below), whose sum is σ = 25969835152800. Its totient is φ = 17135356604800.

The previous prime is 21530353002997. The next prime is 21530353003051. The reversal of 21530353003015 is 51030035303512.

It is not a de Polignac number, because 21530353003015 - 2⁹ = 21530353002503 is a prime.

It is a super-2 number, since 2×21530353003015² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10429440 + ... + 12322090.

It is an arithmetic number, because the mean of its divisors is an integer number (1623114697050).

Almost surely, 2^{21530353003015} is an apocalyptic number.

21530353003015 is a deficient number, since it is larger than the sum of its proper divisors (4439482149785).

21530353003015 is a wasteful number, since it uses less digits than its factorization.

21530353003015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904402.

The product of its (nonzero) digits is 20250, while the sum is 31.

Adding to 21530353003015 its reverse (51030035303512), we get a palindrome (72560388306527).

The spelling of 21530353003015 in words is "twenty-one trillion, five hundred thirty billion, three hundred fifty-three million, three thousand, fifteen".