21121273532 has 12 divisors (see below), whose sum is σ = 36992608800. Its totient is φ = 10551956736.

The previous prime is 21121273489. The next prime is 21121273541. The reversal of 21121273532 is 23537212112.

It is a super-2 number, since 2×21121273532² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121273495 and 21121273504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2164532 + ... + 2174267.

It is an arithmetic number, because the mean of its divisors is an integer number (3082717400).

Almost surely, 2^21121273532 is an apocalyptic number.

It is an amenable number.

21121273532 is a deficient number, since it is larger than the sum of its proper divisors (15871335268).

21121273532 is a wasteful number, since it uses less digits than its factorization.

21121273532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4340020 (or 4340018 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

Adding to 21121273532 its reverse (23537212112), we get a palindrome (44658485644).

The spelling of 21121273532 in words is "twenty-one billion, one hundred twenty-one million, two hundred seventy-three thousand, five hundred thirty-two".