1242031421 has 2 divisors, whose sum is σ = 1242031422. Its totient is φ = 1242031420.

The previous prime is 1242031411. The next prime is 1242031457. The reversal of 1242031421 is 1241302421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1002988900 + 239042521 = 31670^2 + 15461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242031421 - 2¹⁴ = 1242015037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242031393 and 1242031402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242031411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621015710 + 621015711.

It is an arithmetic number, because the mean of its divisors is an integer number (621015711).

Almost surely, 2^1242031421 is an apocalyptic number.

It is an amenable number.

1242031421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242031421 is an equidigital number, since it uses as much as digits as its factorization.

1242031421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1242031421 is about 35242.4661594503. The cubic root of 1242031421 is about 1074.9234258779.

Adding to 1242031421 its reverse (1241302421), we get a palindrome (2483333842).

Subtracting from 1242031421 its reverse (1241302421), we obtain a cube (729000 = 90³).

The spelling of 1242031421 in words is "one billion, two hundred forty-two million, thirty-one thousand, four hundred twenty-one".