21216210634110 has 32 divisors (see below), whose sum is σ = 51098831003520. Its totient is φ = 5637664448928.

The previous prime is 21216210634109. The next prime is 21216210634117. The reversal of 21216210634110 is 1143601261212.

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 (21216210634117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1249473880 + ... + 1249490859.

It is an arithmetic number, because the mean of its divisors is an integer number (1596838468860).

Almost surely, 2^{21216210634110} is an apocalyptic number.

21216210634110 is an abundant number, since it is smaller than the sum of its proper divisors (29882620369410).

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

21216210634110 is a wasteful number, since it uses less digits than its factorization.

21216210634110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498965032.

The product of its (nonzero) digits is 3456, while the sum is 30.

Adding to 21216210634110 its reverse (1143601261212), we get a palindrome (22359811895322).

The spelling of 21216210634110 in words is "twenty-one trillion, two hundred sixteen billion, two hundred ten million, six hundred thirty-four thousand, one hundred ten".