1021200312 has 48 divisors (see below), whose sum is σ = 2806198920. Its totient is φ = 309453760.

The previous prime is 1021200307. The next prime is 1021200331. The reversal of 1021200312 is 2130021201.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172923 + ... + 178730.

Almost surely, 2^1021200312 is an apocalyptic number.

1021200312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021200312 is an abundant number, since it is smaller than the sum of its proper divisors (1784998608).

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

1021200312 is a wasteful number, since it uses less digits than its factorization.

1021200312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351684 (or 351669 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1021200312 is about 31956.2249334930. The cubic root of 1021200312 is about 1007.0174114151.

Adding to 1021200312 its reverse (2130021201), we get a palindrome (3151221513).

The spelling of 1021200312 in words is "one billion, twenty-one million, two hundred thousand, three hundred twelve".