21400035132 has 96 divisors (see below), whose sum is σ = 60865233408. Its totient is φ = 5712574464.

The previous prime is 21400035127. The next prime is 21400035133. The reversal of 21400035132 is 23153000412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21400035099 and 21400035108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400035133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140943 + ... + 250329.

It is an arithmetic number, because the mean of its divisors is an integer number (634012848).

Almost surely, 2^21400035132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21400035132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30432616704).

21400035132 is an abundant number, since it is smaller than the sum of its proper divisors (39465198276).

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

21400035132 is a wasteful number, since it uses less digits than its factorization.

21400035132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109555 (or 109553 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 21400035132 its reverse (23153000412), we get a palindrome (44553035544).

The spelling of 21400035132 in words is "twenty-one billion, four hundred million, thirty-five thousand, one hundred thirty-two".