21101212220010 has 64 divisors (see below), whose sum is σ = 54538998433920. Its totient is φ = 5194098766080.

The previous prime is 21101212219937. The next prime is 21101212220047. The reversal of 21101212220010 is 1002221210112.

It is a super-2 number, since 2×21101212220010² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 72401980 + ... + 72692840.

It is an arithmetic number, because the mean of its divisors is an integer number (852171850530).

Almost surely, 2^{21101212220010} is an apocalyptic number.

21101212220010 is an abundant number, since it is smaller than the sum of its proper divisors (33437786213910).

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

21101212220010 is a wasteful number, since it uses less digits than its factorization.

21101212220010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476903.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21101212220010 its reverse (1002221210112), we get a palindrome (22103433430122).

The spelling of 21101212220010 in words is "twenty-one trillion, one hundred one billion, two hundred twelve million, two hundred twenty thousand, ten".