1025412121021 has 4 divisors (see below), whose sum is σ = 1025431340032. Its totient is φ = 1025392902012.

The previous prime is 1025412121001. The next prime is 1025412121049. The reversal of 1025412121021 is 1201212145201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1025412121021 - 2²³ = 1025403732413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1025412120983 and 1025412121001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025412121001) 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, 9529251 + ... + 9636256.

It is an arithmetic number, because the mean of its divisors is an integer number (256357835008).

Almost surely, 2^{1025412121021} is an apocalyptic number.

It is an amenable number.

1025412121021 is a deficient number, since it is larger than the sum of its proper divisors (19219011).

1025412121021 is an equidigital number, since it uses as much as digits as its factorization.

1025412121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19219010.

The product of its (nonzero) digits is 320, while the sum is 22.

Adding to 1025412121021 its reverse (1201212145201), we get a palindrome (2226624266222).

The spelling of 1025412121021 in words is "one trillion, twenty-five billion, four hundred twelve million, one hundred twenty-one thousand, twenty-one".