21235427532 has 360 divisors, whose sum is σ = 65714528880. Its totient is φ = 5926901760.

The previous prime is 21235427531. The next prime is 21235427581. The reversal of 21235427532 is 23572453212.

21235427532 is a `hidden beast` number, since 2 + 1 + 2 + 354 + 275 + 32 = 666.

It is a super-2 number, since 2×21235427532² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21235427531) 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 119 ways as a sum of consecutive naturals, for example, 54589594 + ... + 54589982.

It is an arithmetic number, because the mean of its divisors is an integer number (182540358).

Almost surely, 2^21235427532 is an apocalyptic number.

21235427532 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21235427532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32857264440).

21235427532 is an abundant number, since it is smaller than the sum of its proper divisors (44479101348).

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

21235427532 is a wasteful number, since it uses less digits than its factorization.

21235427532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 475 counting only the distinct ones).

The product of its digits is 100800, while the sum is 36.

The spelling of 21235427532 in words is "twenty-one billion, two hundred thirty-five million, four hundred twenty-seven thousand, five hundred thirty-two".