10521213345 has 48 divisors (see below), whose sum is σ = 18535188672. Its totient is φ = 5519733120.

The previous prime is 10521213343. The next prime is 10521213347. The reversal of 10521213345 is 54331212501.

10521213345 is a `hidden beast` number, since 1 + 0 + 521 + 2 + 133 + 4 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (10521213343) and next prime (10521213347).

It is not a de Polignac number, because 10521213345 - 2¹ = 10521213343 is a prime.

It is a super-2 number, since 2×10521213345² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10521213343) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2569750 + ... + 2573840.

It is an arithmetic number, because the mean of its divisors is an integer number (386149764).

Almost surely, 2^10521213345 is an apocalyptic number.

10521213345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10521213345 is a deficient number, since it is larger than the sum of its proper divisors (8013975327).

10521213345 is a wasteful number, since it uses less digits than its factorization.

10521213345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5022 (or 5019 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 10521213345 its reverse (54331212501), we get a palindrome (64852425846).

The spelling of 10521213345 in words is "ten billion, five hundred twenty-one million, two hundred thirteen thousand, three hundred forty-five".