1221110010 has 24 divisors (see below), whose sum is σ = 3174886260. Its totient is φ = 325629312.

The previous prime is 1221109973. The next prime is 1221110071. The reversal of 1221110010 is 100111221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1214592201 + 6517809 = 34851^2 + 2553^2 .

It is a super-2 number, since 2×1221110010² = 2982219313044400200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1221109974 and 1221110001.

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, 6783855 + ... + 6784034.

Almost surely, 2^1221110010 is an apocalyptic number.

1221110010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221110010 is an abundant number, since it is smaller than the sum of its proper divisors (1953776250).

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

1221110010 is a wasteful number, since it uses less digits than its factorization.

1221110010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13567902 (or 13567899 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1221110010 is about 34944.3845274173. The cubic root of 1221110010 is about 1068.8536971303.

Adding to 1221110010 its reverse (100111221), we get a palindrome (1321221231).

The spelling of 1221110010 in words is "one billion, two hundred twenty-one million, one hundred ten thousand, ten".