21021201111200 has 36 divisors (see below), whose sum is σ = 51318007214670. Its totient is φ = 8408480444160.

The previous prime is 21021201111137. The next prime is 21021201111227. The reversal of 21021201111200 is 211110212012.

It can be written as a sum of positive squares in 3 ways, for example, as 16678761953296 + 4342439157904 = 4083964^2 + 2083852^2 .

It is a super-2 number, since 2×21021201111200² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 13138249895 + ... + 13138251494.

Almost surely, 2^{21021201111200} is an apocalyptic number.

21021201111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021201111200 is an abundant number, since it is smaller than the sum of its proper divisors (30296806103470).

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

21021201111200 is a wasteful number, since it uses less digits than its factorization.

21021201111200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26276501409 (or 26276501396 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21021201111200 its reverse (211110212012), we get a palindrome (21232311323212).

The spelling of 21021201111200 in words is "twenty-one trillion, twenty-one billion, two hundred one million, one hundred eleven thousand, two hundred".