21011213532 has 48 divisors (see below), whose sum is σ = 50372058240. Its totient is φ = 6811624512.

The previous prime is 21011213519. The next prime is 21011213537. The reversal of 21011213532 is 23531211012.

It is a junction number, because it is equal to n+sod(n) for n = 21011213499 and 21011213508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011213537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1243243 + ... + 1260029.

It is an arithmetic number, because the mean of its divisors is an integer number (1049417880).

Almost surely, 2^21011213532 is an apocalyptic number.

It is an amenable number.

21011213532 is an abundant number, since it is smaller than the sum of its proper divisors (29360844708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21011213532 is a wasteful number, since it uses less digits than its factorization.

21011213532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19650 (or 19648 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21011213532 its reverse (23531211012), we get a palindrome (44542424544).

The spelling of 21011213532 in words is "twenty-one billion, eleven million, two hundred thirteen thousand, five hundred thirty-two".