1221331022010 has 144 divisors (see below), whose sum is σ = 3491201226240. Its totient is φ = 296010792000.

The previous prime is 1221331021997. The next prime is 1221331022077. The reversal of 1221331022010 is 102201331221.

1221331022010 is a `hidden beast` number, since 122 + 1 + 3 + 310 + 220 + 10 = 666.

It is a super-2 number, since 2×1221331022010² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 58261911 + ... + 58282869.

It is an arithmetic number, because the mean of its divisors is an integer number (24244452960).

Almost surely, 2^{1221331022010} is an apocalyptic number.

1221331022010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221331022010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1745600613120).

1221331022010 is an abundant number, since it is smaller than the sum of its proper divisors (2269870204230).

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

1221331022010 is a wasteful number, since it uses less digits than its factorization.

1221331022010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26345 (or 26331 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1221331022010 its reverse (102201331221), we get a palindrome (1323532353231).

The spelling of 1221331022010 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, twenty-two thousand, ten".