1221622250 has 16 divisors (see below), whose sum is σ = 2286877320. Its totient is φ = 488648800.

The previous prime is 1221622249. The next prime is 1221622273. The reversal of 1221622250 is 522261221.

It can be written as a sum of positive squares in 4 ways, for example, as 416935561 + 804686689 = 20419^2 + 28367^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2442995 + ... + 2443494.

Almost surely, 2^1221622250 is an apocalyptic number.

1221622250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221622250 is a deficient number, since it is larger than the sum of its proper divisors (1065255070).

1221622250 is an equidigital number, since it uses as much as digits as its factorization.

1221622250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4886506 (or 4886496 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1221622250 is about 34951.7131196741. The cubic root of 1221622250 is about 1069.0031330461.

Adding to 1221622250 its reverse (522261221), we get a palindrome (1743883471).

The spelling of 1221622250 in words is "one billion, two hundred twenty-one million, six hundred twenty-two thousand, two hundred fifty".