21400454352 has 160 divisors (see below), whose sum is σ = 60233144832. Its totient is φ = 6521454592.

The previous prime is 21400454323. The next prime is 21400454371. The reversal of 21400454352 is 25345400412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5252188 + ... + 5256260.

Almost surely, 2^21400454352 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 21400454352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30116572416).

21400454352 is an abundant number, since it is smaller than the sum of its proper divisors (38832690480).

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

21400454352 is a wasteful number, since it uses less digits than its factorization.

21400454352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4285 (or 4279 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21400454352 its reverse (25345400412), we get a palindrome (46745854764).

The spelling of 21400454352 in words is "twenty-one billion, four hundred million, four hundred fifty-four thousand, three hundred fifty-two".