21235353400 has 96 divisors (see below), whose sum is σ = 51196723200. Its totient is φ = 8182742400.

The previous prime is 21235353383. The next prime is 21235353407. The reversal of 21235353400 is 435353212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21235353407) 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 23 ways as a sum of consecutive naturals, for example, 1374921 + ... + 1390279.

It is an arithmetic number, because the mean of its divisors is an integer number (533299200).

Almost surely, 2^21235353400 is an apocalyptic number.

21235353400 is a gapful number since it is divisible by the number (20) 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 21235353400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25598361600).

21235353400 is an abundant number, since it is smaller than the sum of its proper divisors (29961369800).

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

21235353400 is a wasteful number, since it uses less digits than its factorization.

21235353400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15629 (or 15620 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 28.

The spelling of 21235353400 in words is "twenty-one billion, two hundred thirty-five million, three hundred fifty-three thousand, four hundred".