1021240421 has 8 divisors (see below), whose sum is σ = 1031478624. Its totient is φ = 1011015280.

The previous prime is 1021240417. The next prime is 1021240463. The reversal of 1021240421 is 1240421201.

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 1021240421 - 2² = 1021240417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021240421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021240721) 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, 247586 + ... + 251676.

It is an arithmetic number, because the mean of its divisors is an integer number (128934828).

Almost surely, 2^1021240421 is an apocalyptic number.

It is an amenable number.

1021240421 is a deficient number, since it is larger than the sum of its proper divisors (10238203).

1021240421 is a wasteful number, since it uses less digits than its factorization.

1021240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6531.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1021240421 is about 31956.8524889420. The cubic root of 1021240421 is about 1007.0305952251.

Adding to 1021240421 its reverse (1240421201), we get a palindrome (2261661622).

The spelling of 1021240421 in words is "one billion, twenty-one million, two hundred forty thousand, four hundred twenty-one".