21022201400 has 96 divisors (see below), whose sum is σ = 49943790000. Its totient is φ = 8227000320.

The previous prime is 21022201391. The next prime is 21022201469. The reversal of 21022201400 is 410222012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1991336 + ... + 2001864.

Almost surely, 2^21022201400 is an apocalyptic number.

21022201400 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 21022201400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24971895000).

21022201400 is an abundant number, since it is smaller than the sum of its proper divisors (28921588600).

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

21022201400 is a wasteful number, since it uses less digits than its factorization.

21022201400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10761 (or 10752 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21022201400 its reverse (410222012), we get a palindrome (21432423412).

The spelling of 21022201400 in words is "twenty-one billion, twenty-two million, two hundred one thousand, four hundred".