21202220021000 has 64 divisors (see below), whose sum is σ = 52531618117680. Its totient is φ = 7982012236800.

The previous prime is 21202220020907. The next prime is 21202220021009. The reversal of 21202220021000 is 12002220212.

It can be written as a sum of positive squares in 8 ways, for example, as 7156919758564 + 14045300262436 = 2675242^2 + 3747706^2 .

It is not an unprimeable number, because it can be changed into a prime (21202220021009) 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 15 ways as a sum of consecutive naturals, for example, 623577707 + ... + 623611706.

Almost surely, 2^{21202220021000} is an apocalyptic number.

21202220021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202220021000 is an abundant number, since it is smaller than the sum of its proper divisors (31329398096680).

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

21202220021000 is a wasteful number, since it uses less digits than its factorization.

21202220021000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247189451 (or 1247189437 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21202220021000 its reverse (12002220212), we get a palindrome (21214222241212).

The spelling of 21202220021000 in words is "twenty-one trillion, two hundred two billion, two hundred twenty million, twenty-one thousand".