21012212000 has 96 divisors (see below), whose sum is σ = 55598450544. Its totient is φ = 7758336000.

The previous prime is 21012211963. The next prime is 21012212009. The reversal of 21012212000 is 21221012.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 778856464 + 20233355536 = 27908^2 + 142244^2 .

It is not an unprimeable number, because it can be changed into a prime (21012212009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150041 + ... + 254040.

Almost surely, 2^21012212000 is an apocalyptic number.

21012212000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012212000 is an abundant number, since it is smaller than the sum of its proper divisors (34586238544).

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

21012212000 is a wasteful number, since it uses less digits than its factorization.

21012212000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404119 (or 404101 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21012212000 its reverse (21221012), we get a palindrome (21033433012).

The spelling of 21012212000 in words is "twenty-one billion, twelve million, two hundred twelve thousand".