1020423331402 has 4 divisors (see below), whose sum is σ = 1530634997106. Its totient is φ = 510211665700.

The previous prime is 1020423331373. The next prime is 1020423331513. The reversal of 1020423331402 is 2041333240201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 956349040761 + 64074290641 = 977931^2 + 253129^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255105832849 + ... + 255105832852.

Almost surely, 2^{1020423331402} is an apocalyptic number.

1020423331402 is a deficient number, since it is larger than the sum of its proper divisors (510211665704).

1020423331402 is an equidigital number, since it uses as much as digits as its factorization.

1020423331402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510211665703.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 1020423331402 its reverse (2041333240201), we get a palindrome (3061756571603).

The spelling of 1020423331402 in words is "one trillion, twenty billion, four hundred twenty-three million, three hundred thirty-one thousand, four hundred two".