21220212212000 has 48 divisors (see below), whose sum is σ = 52138061414712. Its totient is φ = 8488084883200.

The previous prime is 21220212211999. The next prime is 21220212212027. The reversal of 21220212212000 is 21221202212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3665218354576 + 17554993857424 = 1914476^2 + 4189868^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21220212212000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2652522527 + ... + 2652530526.

Almost surely, 2^{21220212212000} is an apocalyptic number.

21220212212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220212212000 is an abundant number, since it is smaller than the sum of its proper divisors (30917849202712).

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

21220212212000 is an equidigital number, since it uses as much as digits as its factorization.

21220212212000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5305053078 (or 5305053060 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21220212212000 its reverse (21221202212), we get a palindrome (21241433414212).

The spelling of 21220212212000 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, two hundred twelve thousand".