21120220310 has 32 divisors (see below), whose sum is σ = 43895234880. Its totient is φ = 7166564352.

The previous prime is 21120220307. The next prime is 21120220339. The reversal of 21120220310 is 1302202112.

It is a happy number.

It is a super-2 number, since 2×21120220310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1548455 + ... + 1562034.

It is an arithmetic number, because the mean of its divisors is an integer number (1371726090).

Almost surely, 2^21120220310 is an apocalyptic number.

21120220310 is an abundant number, since it is smaller than the sum of its proper divisors (22775014570).

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

21120220310 is a wasteful number, since it uses less digits than its factorization.

21120220310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110600.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21120220310 its reverse (1302202112), we get a palindrome (22422422422).

The spelling of 21120220310 in words is "twenty-one billion, one hundred twenty million, two hundred twenty thousand, three hundred ten".