1021221110 has 128 divisors (see below), whose sum is σ = 2414168064. Its totient is φ = 301824000.

The previous prime is 1021221077. The next prime is 1021221133. The reversal of 1021221110 is 111221201.

It is a junction number, because it is equal to n+sod(n) for n = 1021221091 and 1021221100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3882839 + ... + 3883101.

It is an arithmetic number, because the mean of its divisors is an integer number (18860688).

Almost surely, 2^1021221110 is an apocalyptic number.

1021221110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021221110 is an abundant number, since it is smaller than the sum of its proper divisors (1392946954).

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

1021221110 is a wasteful number, since it uses less digits than its factorization.

1021221110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558.

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

The square root of 1021221110 is about 31956.5503457429. The cubic root of 1021221110 is about 1007.0242477513.

Adding to 1021221110 its reverse (111221201), we get a palindrome (1132442311).

Subtracting from 1021221110 its reverse (111221201), we obtain a palindrome (909999909).

The spelling of 1021221110 in words is "one billion, twenty-one million, two hundred twenty-one thousand, one hundred ten".