1421250021 has 12 divisors (see below), whose sum is σ = 2053304448. Its totient is φ = 947321064.

The previous prime is 1421250007. The next prime is 1421250043. The reversal of 1421250021 is 1200521241.

1421250021 is a `hidden beast` number, since 142 + 1 + 2 + 500 + 21 = 666.

It is not a de Polignac number, because 1421250021 - 2⁹ = 1421249509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1421249976 and 1421250003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421250071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50476 + ... + 73418.

It is an arithmetic number, because the mean of its divisors is an integer number (171108704).

Almost surely, 2^1421250021 is an apocalyptic number.

It is an amenable number.

1421250021 is a deficient number, since it is larger than the sum of its proper divisors (632054427).

1421250021 is a wasteful number, since it uses less digits than its factorization.

1421250021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29832 (or 29829 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1421250021 is about 37699.4697708071. The cubic root of 1421250021 is about 1124.3205829500.

Adding to 1421250021 its reverse (1200521241), we get a palindrome (2621771262).

The spelling of 1421250021 in words is "one billion, four hundred twenty-one million, two hundred fifty thousand, twenty-one".