1242021399 has 8 divisors (see below), whose sum is σ = 1657027440. Its totient is φ = 827514816.

The previous prime is 1242021371. The next prime is 1242021401. The reversal of 1242021399 is 9931202421.

1242021399 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1242021399 - 2¹¹ = 1242019351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242021299) 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, 119022 + ... + 129035.

It is an arithmetic number, because the mean of its divisors is an integer number (207128430).

Almost surely, 2^1242021399 is an apocalyptic number.

1242021399 is a deficient number, since it is larger than the sum of its proper divisors (415006041).

1242021399 is a wasteful number, since it uses less digits than its factorization.

1242021399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249729.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1242021399 is about 35242.3239727462. The cubic root of 1242021399 is about 1074.9205346704.

The spelling of 1242021399 in words is "one billion, two hundred forty-two million, twenty-one thousand, three hundred ninety-nine".