1020125424221 has 4 divisors (see below), whose sum is σ = 1020139031100. Its totient is φ = 1020111817344.

The previous prime is 1020125424211. The next prime is 1020125424229. The reversal of 1020125424221 is 1224245210201.

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

It can be written as a sum of positive squares in 2 ways, for example, as 219154123321 + 800971300900 = 468139^2 + 894970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020125424221 - 2²² = 1020121229917 is a prime.

It is a super-2 number, since 2×1020125424221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020125424229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6690356 + ... + 6841133.

It is an arithmetic number, because the mean of its divisors is an integer number (255034757775).

Almost surely, 2^{1020125424221} is an apocalyptic number.

It is an amenable number.

1020125424221 is a deficient number, since it is larger than the sum of its proper divisors (13606879).

1020125424221 is an equidigital number, since it uses as much as digits as its factorization.

1020125424221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13606878.

The product of its (nonzero) digits is 2560, while the sum is 26.

The spelling of 1020125424221 in words is "one trillion, twenty billion, one hundred twenty-five million, four hundred twenty-four thousand, two hundred twenty-one".