21221301200 has 60 divisors (see below), whose sum is σ = 55619112768. Its totient is φ = 7716835200.

The previous prime is 21221301113. The next prime is 21221301239. The reversal of 21221301200 is 210312212.

It is a happy number.

It is a super-2 number, since 2×21221301200² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2407112 + ... + 2415911.

Almost surely, 2^21221301200 is an apocalyptic number.

21221301200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221301200 is an abundant number, since it is smaller than the sum of its proper divisors (34397811568).

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

21221301200 is a wasteful number, since it uses less digits than its factorization.

21221301200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4823052 (or 4823041 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21221301200 its reverse (210312212), we get a palindrome (21431613412).

The spelling of 21221301200 in words is "twenty-one billion, two hundred twenty-one million, three hundred one thousand, two hundred".