21202012000 has 192 divisors, whose sum is σ = 56338970688. Its totient is φ = 7795200000.

The previous prime is 21202011997. The next prime is 21202012003. The reversal of 21202012000 is 21020212.

It is an interprime number because it is at equal distance from previous prime (21202011997) and next prime (21202012003).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202012003) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 14611275 + ... + 14612725.

It is an arithmetic number, because the mean of its divisors is an integer number (293432139).

Almost surely, 2^21202012000 is an apocalyptic number.

21202012000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202012000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28169485344).

21202012000 is an abundant number, since it is smaller than the sum of its proper divisors (35136958688).

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

21202012000 is a wasteful number, since it uses less digits than its factorization.

21202012000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770 (or 1752 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21202012000 its reverse (21020212), we get a palindrome (21223032212).

The spelling of 21202012000 in words is "twenty-one billion, two hundred two million, twelve thousand".