1021200420 has 24 divisors (see below), whose sum is σ = 2859361344. Its totient is φ = 272320096.

The previous prime is 1021200347. The next prime is 1021200469. The reversal of 1021200420 is 240021201.

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

It is a junction number, because it is equal to n+sod(n) for n = 1021200396 and 1021200405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8509944 + ... + 8510063.

It is an arithmetic number, because the mean of its divisors is an integer number (119140056).

Almost surely, 2^1021200420 is an apocalyptic number.

1021200420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021200420 is an abundant number, since it is smaller than the sum of its proper divisors (1838160924).

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

1021200420 is a wasteful number, since it uses less digits than its factorization.

1021200420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17020019 (or 17020017 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1021200420 is about 31956.2266233046. The cubic root of 1021200420 is about 1007.0174469151.

Adding to 1021200420 its reverse (240021201), we get a palindrome (1261221621).

The spelling of 1021200420 in words is "one billion, twenty-one million, two hundred thousand, four hundred twenty".