21212202121000 has 128 divisors (see below), whose sum is σ = 54151460064000. Its totient is φ = 7713172896000.

The previous prime is 21212202120971. The next prime is 21212202121009. The reversal of 21212202121000 is 12120221212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21212202121009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 416643546 + ... + 416694454.

It is an arithmetic number, because the mean of its divisors is an integer number (423058281750).

Almost surely, 2^{21212202121000} is an apocalyptic number.

21212202121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212202121000 is an abundant number, since it is smaller than the sum of its proper divisors (32939257943000).

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

21212202121000 is a wasteful number, since it uses less digits than its factorization.

21212202121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88820 (or 88806 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212202121000 its reverse (12120221212), we get a palindrome (21224322342212).

It can be divided in two parts, 2121220212 and 1000, that added together give a palindrome (2121221212).

The spelling of 21212202121000 in words is "twenty-one trillion, two hundred twelve billion, two hundred two million, one hundred twenty-one thousand".