21122121212000 has 48 divisors (see below), whose sum is σ = 51897051827712. Its totient is φ = 8448848483200.

The previous prime is 21122121211949. The next prime is 21122121212009. The reversal of 21122121212000 is 21212122112.

It is a super-2 number, since 2×21122121212000² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122121212000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122121212009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2640261152 + ... + 2640269151.

It is an arithmetic number, because the mean of its divisors is an integer number (1081188579744).

Almost surely, 2^{21122121212000} is an apocalyptic number.

21122121212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122121212000 is an abundant number, since it is smaller than the sum of its proper divisors (30774930615712).

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

21122121212000 is an equidigital number, since it uses as much as digits as its factorization.

21122121212000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5280530328 (or 5280530310 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21122121212000 its reverse (21212122112), we get a palindrome (21143333334112).

The spelling of 21122121212000 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twelve thousand".