1221011050 has 24 divisors (see below), whose sum is σ = 2595521376. Its totient is φ = 418632240.

The previous prime is 1221011047. The next prime is 1221011053. The reversal of 1221011050 is 501101221.

It is an interprime number because it is at equal distance from previous prime (1221011047) and next prime (1221011053).

It is a self number, because there is not a number n which added to its sum of digits gives 1221011050.

It is not an unprimeable number, because it can be changed into a prime (1221011053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1743952 + ... + 1744651.

It is an arithmetic number, because the mean of its divisors is an integer number (108146724).

Almost surely, 2^1221011050 is an apocalyptic number.

1221011050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221011050 is an abundant number, since it is smaller than the sum of its proper divisors (1374510326).

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

1221011050 is a wasteful number, since it uses less digits than its factorization.

1221011050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3488622 (or 3488617 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 1221011050 is about 34942.9685344563. The cubic root of 1221011050 is about 1068.8248226858.

Adding to 1221011050 its reverse (501101221), we get a palindrome (1722112271).

The spelling of 1221011050 in words is "one billion, two hundred twenty-one million, eleven thousand, fifty".