1021031004420 has 144 divisors (see below), whose sum is σ = 3540054056448. Its totient is φ = 233346873600.

The previous prime is 1021031004379. The next prime is 1021031004421. The reversal of 1021031004420 is 244001301201.

1021031004420 is a `hidden beast` number, since 1 + 0 + 210 + 3 + 10 + 0 + 442 + 0 = 666.

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 = 1021031004393 and 1021031004402.

It is not an unprimeable number, because it can be changed into a prime (1021031004421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9967302 + ... + 10069218.

Almost surely, 2^{1021031004420} is an apocalyptic number.

1021031004420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021031004420 is an abundant number, since it is smaller than the sum of its proper divisors (2519023052028).

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

1021031004420 is a wasteful number, since it uses less digits than its factorization.

1021031004420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109890 (or 109885 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1021031004420 its reverse (244001301201), we get a palindrome (1265032305621).

The spelling of 1021031004420 in words is "one trillion, twenty-one billion, thirty-one million, four thousand, four hundred twenty".