1211502000 has 160 divisors (see below), whose sum is σ = 4076167680. Its totient is φ = 308985600.

The previous prime is 1211501987. The next prime is 1211502031. The reversal of 1211502000 is 2051121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133611 + ... + 142389.

It is an arithmetic number, because the mean of its divisors is an integer number (25476048).

Almost surely, 2^1211502000 is an apocalyptic number.

1211502000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211502000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2038083840).

1211502000 is an abundant number, since it is smaller than the sum of its proper divisors (2864665680).

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

1211502000 is a wasteful number, since it uses less digits than its factorization.

1211502000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8828 (or 8812 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1211502000 is about 34806.6372980787. The cubic root of 1211502000 is about 1066.0429730631.

Adding to 1211502000 its reverse (2051121), we get a palindrome (1213553121).

The spelling of 1211502000 in words is "one billion, two hundred eleven million, five hundred two thousand".