21535513002045 has 48 divisors (see below), whose sum is σ = 42661627482240. Its totient is φ = 9844620930432.

The previous prime is 21535513001941. The next prime is 21535513002071. The reversal of 21535513002045 is 54020031553512.

21535513002045 is a `hidden beast` number, since 2 + 1 + 53 + 551 + 30 + 0 + 20 + 4 + 5 = 666.

It is not a de Polignac number, because 21535513002045 - 2⁷ = 21535513001917 is a prime.

It is a super-2 number, since 2×21535513002045² (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 47 ways as a sum of consecutive naturals, for example, 16905387 + ... + 18134583.

It is an arithmetic number, because the mean of its divisors is an integer number (888783905880).

Almost surely, 2^{21535513002045} is an apocalyptic number.

It is an amenable number.

21535513002045 is a deficient number, since it is larger than the sum of its proper divisors (21126114480195).

21535513002045 is a wasteful number, since it uses less digits than its factorization.

21535513002045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284834 (or 1284831 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

Adding to 21535513002045 its reverse (54020031553512), we get a palindrome (75555544555557).

The spelling of 21535513002045 in words is "twenty-one trillion, five hundred thirty-five billion, five hundred thirteen million, two thousand, forty-five".