1021204420 has 48 divisors (see below), whose sum is σ = 2206245888. Its totient is φ = 396829440.

The previous prime is 1021204411. The next prime is 1021204427. The reversal of 1021204420 is 244021201.

It is a junction number, because it is equal to n+sod(n) for n = 1021204394 and 1021204403.

It is not an unprimeable number, because it can be changed into a prime (1021204427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161152 + ... + 167368.

It is an arithmetic number, because the mean of its divisors is an integer number (45963456).

Almost surely, 2^1021204420 is an apocalyptic number.

1021204420 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 1021204420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1103122944).

1021204420 is an abundant number, since it is smaller than the sum of its proper divisors (1185041468).

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

1021204420 is a wasteful number, since it uses less digits than its factorization.

1021204420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6460 (or 6458 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1021204420 is about 31956.2892088553. The cubic root of 1021204420 is about 1007.0187617287.

Adding to 1021204420 its reverse (244021201), we get a palindrome (1265225621).

The spelling of 1021204420 in words is "one billion, twenty-one million, two hundred four thousand, four hundred twenty".