1211012250 has 128 divisors (see below), whose sum is σ = 3472035840. Its totient is φ = 275400000.

The previous prime is 1211012239. The next prime is 1211012263. The reversal of 1211012250 is 522101121.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1317291 + ... + 1318209.

It is an arithmetic number, because the mean of its divisors is an integer number (27125280).

Almost surely, 2^1211012250 is an apocalyptic number.

1211012250 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 1211012250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1736017920).

1211012250 is an abundant number, since it is smaller than the sum of its proper divisors (2261023590).

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

1211012250 is a wasteful number, since it uses less digits than its factorization.

1211012250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197 (or 1187 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1211012250 is about 34799.6012908194. The cubic root of 1211012250 is about 1065.8993043185.

Adding to 1211012250 its reverse (522101121), we get a palindrome (1733113371).

The spelling of 1211012250 in words is "one billion, two hundred eleven million, twelve thousand, two hundred fifty".