21022210100 has 18 divisors (see below), whose sum is σ = 45618196134. Its totient is φ = 8408884000.

The previous prime is 21022210073. The next prime is 21022210103. The reversal of 21022210100 is 101222012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1736222224 + 19285987876 = 41668^2 + 138874^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022210103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105110951 + ... + 105111150.

Almost surely, 2^21022210100 is an apocalyptic number.

21022210100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022210100 is an abundant number, since it is smaller than the sum of its proper divisors (24595986034).

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

21022210100 is a wasteful number, since it uses less digits than its factorization.

21022210100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210222115 (or 210222108 counting only the distinct ones).

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

Adding to 21022210100 its reverse (101222012), we get a palindrome (21123432112).

The spelling of 21022210100 in words is "twenty-one billion, twenty-two million, two hundred ten thousand, one hundred".