1201321000 has 64 divisors (see below), whose sum is σ = 3066672960. Its totient is φ = 436840000.

The previous prime is 1201320943. The next prime is 1201321061. The reversal of 1201321000 is 1231021.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43606 + ... + 65605.

It is an arithmetic number, because the mean of its divisors is an integer number (47916765).

Almost surely, 2^1201321000 is an apocalyptic number.

1201321000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201321000 is an abundant number, since it is smaller than the sum of its proper divisors (1865351960).

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

1201321000 is a wasteful number, since it uses less digits than its factorization.

1201321000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109243 (or 109229 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1201321000 is about 34660.0778995085. The cubic root of 1201321000 is about 1063.0483628433.

Adding to 1201321000 its reverse (1231021), we get a palindrome (1202552021).

The spelling of 1201321000 in words is "one billion, two hundred one million, three hundred twenty-one thousand".