21000110021010 has 32 divisors (see below), whose sum is σ = 56000293390080. Its totient is φ = 5600029338864.

The previous prime is 21000110020937. The next prime is 21000110021021. The reversal of 21000110021010 is 1012001100012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21000110020983 and 21000110021001.

It is an unprimeable number.

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, 38889092362 + ... + 38889092901.

It is an arithmetic number, because the mean of its divisors is an integer number (1750009168440).

Almost surely, 2^{21000110021010} is an apocalyptic number.

21000110021010 is an abundant number, since it is smaller than the sum of its proper divisors (35000183369070).

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

21000110021010 is a wasteful number, since it uses less digits than its factorization.

21000110021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77778185279 (or 77778185273 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21000110021010 its reverse (1012001100012), we get a palindrome (22012111121022).

The spelling of 21000110021010 in words is "twenty-one trillion, one hundred ten million, twenty-one thousand, ten".