1202821020 has 72 divisors (see below), whose sum is σ = 3668814240. Its totient is φ = 318971520.

The previous prime is 1202821013. The next prime is 1202821031. The reversal of 1202821020 is 201282021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1202820984 and 1202821002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14121 + ... + 51039.

Almost surely, 2^1202821020 is an apocalyptic number.

1202821020 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 1202821020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1834407120).

1202821020 is an abundant number, since it is smaller than the sum of its proper divisors (2465993220).

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

1202821020 is a wasteful number, since it uses less digits than its factorization.

1202821020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37115 (or 37110 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1202821020 is about 34681.7101654460. The cubic root of 1202821020 is about 1063.4906344684.

The spelling of 1202821020 in words is "one billion, two hundred two million, eight hundred twenty-one thousand, twenty".