221210101010 has 24 divisors (see below), whose sum is σ = 411436994508. Its totient is φ = 85629712800.

The previous prime is 221210101003. The next prime is 221210101037. The reversal of 221210101010 is 10101012122.

It can be written as a sum of positive squares in 2 ways, for example, as 216426857089 + 4783243921 = 465217^2 + 69161^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221210100982 and 221210101000.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11499761 + ... + 11518980.

Almost surely, 2^221210101010 is an apocalyptic number.

221210101010 is a deficient number, since it is larger than the sum of its proper divisors (190226893498).

221210101010 is a wasteful number, since it uses less digits than its factorization.

221210101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23018810 (or 23018779 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221210101010 its reverse (10101012122), we get a palindrome (231311113132).

The spelling of 221210101010 in words is "two hundred twenty-one billion, two hundred ten million, one hundred one thousand, ten".