21221001212110 has 96 divisors (see below), whose sum is σ = 44555172854400. Its totient is φ = 7255976974848.

The previous prime is 21221001212069. The next prime is 21221001212111. The reversal of 21221001212110 is 1121210012212.

It is a super-4 number, since 4×21221001212110⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221001212111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 436415259 + ... + 436463881.

It is an arithmetic number, because the mean of its divisors is an integer number (464116383900).

Almost surely, 2^{21221001212110} is an apocalyptic number.

21221001212110 is an abundant number, since it is smaller than the sum of its proper divisors (23334171642290).

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

21221001212110 is a wasteful number, since it uses less digits than its factorization.

21221001212110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51050 (or 51043 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221001212110 its reverse (1121210012212), we get a palindrome (22342211224322).

The spelling of 21221001212110 in words is "twenty-one trillion, two hundred twenty-one billion, one million, two hundred twelve thousand, one hundred ten".