1200321021020 has 96 divisors (see below), whose sum is σ = 2898054028800. Its totient is φ = 413007724800.

The previous prime is 1200321021013. The next prime is 1200321021023. The reversal of 1200321021020 is 201201230021.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1200321020986 and 1200321021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200321021023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3292025 + ... + 3638415.

It is an arithmetic number, because the mean of its divisors is an integer number (30188062800).

Almost surely, 2^{1200321021020} is an apocalyptic number.

1200321021020 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 1200321021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1449027014400).

1200321021020 is an abundant number, since it is smaller than the sum of its proper divisors (1697733007780).

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

1200321021020 is a wasteful number, since it uses less digits than its factorization.

1200321021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347259 (or 347257 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1200321021020 its reverse (201201230021), we get a palindrome (1401522251041).

The spelling of 1200321021020 in words is "one trillion, two hundred billion, three hundred twenty-one million, twenty-one thousand, twenty".