21210121010110 has 16 divisors (see below), whose sum is σ = 38237225894496. Its totient is φ = 8470935498208.

The previous prime is 21210121010101. The next prime is 21210121010129. The reversal of 21210121010110 is 1101012101212.

It is a happy number.

It is a super-3 number, since 3×21210121010110³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1639106437 + ... + 1639119376.

It is an arithmetic number, because the mean of its divisors is an integer number (2389826618406).

Almost surely, 2^{21210121010110} is an apocalyptic number.

21210121010110 is a deficient number, since it is larger than the sum of its proper divisors (17027104884386).

21210121010110 is a wasteful number, since it uses less digits than its factorization.

21210121010110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3278226467.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21210121010110 its reverse (1101012101212), we get a palindrome (22311133111322).

The spelling of 21210121010110 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty-one million, ten thousand, one hundred ten".