1020420420421 has 8 divisors (see below), whose sum is σ = 1117701880920. Its totient is φ = 927278596608.

The previous prime is 1020420420413. The next prime is 1020420420431. The reversal of 1020420420421 is 1240240240201.

It can be written as a sum of positive squares in 4 ways, for example, as 229235076225 + 791185344196 = 478785^2 + 889486^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020420420421 - 2³ = 1020420420413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020420420392 and 1020420420401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020420420431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034908656 + ... + 1034909641.

It is an arithmetic number, because the mean of its divisors is an integer number (139712735115).

Almost surely, 2^{1020420420421} is an apocalyptic number.

It is an amenable number.

1020420420421 is a deficient number, since it is larger than the sum of its proper divisors (97281460499).

1020420420421 is a wasteful number, since it uses less digits than its factorization.

1020420420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2069818343.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 1020420420421 its reverse (1240240240201), we get a palindrome (2260660660622).

The spelling of 1020420420421 in words is "one trillion, twenty billion, four hundred twenty million, four hundred twenty thousand, four hundred twenty-one".