21021022120100 has 36 divisors (see below), whose sum is σ = 45638100263700. Its totient is φ = 8404264652160.

The previous prime is 21021022120081. The next prime is 21021022120129. The reversal of 21021022120100 is 102122012012.

It can be written as a sum of positive squares in 6 ways, for example, as 129156859456 + 20891865260644 = 359384^2 + 4570762^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51598535 + ... + 52004334.

It is an arithmetic number, because the mean of its divisors is an integer number (1267725007325).

Almost surely, 2^{21021022120100} is an apocalyptic number.

21021022120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021022120100 is an abundant number, since it is smaller than the sum of its proper divisors (24617078143600).

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

21021022120100 is a wasteful number, since it uses less digits than its factorization.

21021022120100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103604912 (or 103604905 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021022120100 its reverse (102122012012), we get a palindrome (21123144132112).

The spelling of 21021022120100 in words is "twenty-one trillion, twenty-one billion, twenty-two million, one hundred twenty thousand, one hundred".