21202243100 has 36 divisors (see below), whose sum is σ = 46048412088. Its totient is φ = 8473608000.

The previous prime is 21202243081. The next prime is 21202243147. The reversal of 21202243100 is 134220212.

It is a super-2 number, since 2×21202243100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26570 + ... + 207630.

It is an arithmetic number, because the mean of its divisors is an integer number (1279122558).

Almost surely, 2^21202243100 is an apocalyptic number.

21202243100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202243100 is an abundant number, since it is smaller than the sum of its proper divisors (24846168988).

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

21202243100 is a wasteful number, since it uses less digits than its factorization.

21202243100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182246 (or 182239 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21202243100 its reverse (134220212), we get a palindrome (21336463312).

The spelling of 21202243100 in words is "twenty-one billion, two hundred two million, two hundred forty-three thousand, one hundred".