21216055330110 has 64 divisors (see below), whose sum is σ = 51209178531840. Its totient is φ = 5625382604160.

The previous prime is 21216055330031. The next prime is 21216055330117. The reversal of 21216055330110 is 1103355061212.

It is a super-2 number, since 2×21216055330110² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21216055330117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3561121 + ... + 7423859.

It is an arithmetic number, because the mean of its divisors is an integer number (800143414560).

Almost surely, 2^{21216055330110} is an apocalyptic number.

21216055330110 is an abundant number, since it is smaller than the sum of its proper divisors (29993123201730).

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

21216055330110 is a wasteful number, since it uses less digits than its factorization.

21216055330110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863793.

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 21216055330110 in words is "twenty-one trillion, two hundred sixteen billion, fifty-five million, three hundred thirty thousand, one hundred ten".