21002115033 has 12 divisors (see below), whose sum is σ = 30636749988. Its totient is φ = 13862781600.

The previous prime is 21002115007. The next prime is 21002115103. The reversal of 21002115033 is 33051120012.

It can be written as a sum of positive squares in 2 ways, for example, as 9009236889 + 11992878144 = 94917^2 + 109512^2 .

It is not a de Polignac number, because 21002115033 - 2⁹ = 21002114521 is a prime.

It is a super-4 number, since 4×21002115033⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002114997 and 21002115015.

It is not an unprimeable number, because it can be changed into a prime (21002111033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11551410 + ... + 11553227.

It is an arithmetic number, because the mean of its divisors is an integer number (2553062499).

Almost surely, 2^21002115033 is an apocalyptic number.

It is an amenable number.

21002115033 is a deficient number, since it is larger than the sum of its proper divisors (9634634955).

21002115033 is a wasteful number, since it uses less digits than its factorization.

21002115033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23104744 (or 23104741 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 21002115033 its reverse (33051120012), we get a palindrome (54053235045).

The spelling of 21002115033 in words is "twenty-one billion, two million, one hundred fifteen thousand, thirty-three".