1221220010 has 8 divisors (see below), whose sum is σ = 2198196036. Its totient is φ = 488488000.

The previous prime is 1221220001. The next prime is 1221220027. The reversal of 1221220010 is 100221221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1187009209 + 34210801 = 34453^2 + 5849^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1221219973 and 1221220000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61060991 + ... + 61061010.

Almost surely, 2^1221220010 is an apocalyptic number.

1221220010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221220010 is a deficient number, since it is larger than the sum of its proper divisors (976976026).

1221220010 is a wasteful number, since it uses less digits than its factorization.

1221220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122122008.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221220010 is about 34945.9584215400. The cubic root of 1221220010 is about 1068.8857909835.

Adding to 1221220010 its reverse (100221221), we get a palindrome (1321441231).

The spelling of 1221220010 in words is "one billion, two hundred twenty-one million, two hundred twenty thousand, ten".