1025001421 has 4 divisors (see below), whose sum is σ = 1029085344. Its totient is φ = 1020917500.

The previous prime is 1025001407. The next prime is 1025001457. The reversal of 1025001421 is 1241005201.

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 1025001421 - 2¹⁷ = 1024870349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1025001395 and 1025001404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1025001401) 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, 2041585 + ... + 2042086.

It is an arithmetic number, because the mean of its divisors is an integer number (257271336).

Almost surely, 2^1025001421 is an apocalyptic number.

It is an amenable number.

1025001421 is a deficient number, since it is larger than the sum of its proper divisors (4083923).

1025001421 is an equidigital number, since it uses as much as digits as its factorization.

1025001421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4083922.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1025001421 is about 32015.6433794481. The cubic root of 1025001421 is about 1008.2653035420.

Adding to 1025001421 its reverse (1241005201), we get a palindrome (2266006622).

The spelling of 1025001421 in words is "one billion, twenty-five million, one thousand, four hundred twenty-one".