1242130421 has 8 divisors (see below), whose sum is σ = 1433633664. Its totient is φ = 1054141200.

The previous prime is 1242130411. The next prime is 1242130427. The reversal of 1242130421 is 1240312421.

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

It is not a de Polignac number, because 1242130421 - 2²⁶ = 1175021557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242130393 and 1242130402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242130427) 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, 877745 + ... + 879158.

It is an arithmetic number, because the mean of its divisors is an integer number (179204208).

Almost surely, 2^1242130421 is an apocalyptic number.

It is an amenable number.

1242130421 is a deficient number, since it is larger than the sum of its proper divisors (191503243).

1242130421 is a wasteful number, since it uses less digits than its factorization.

1242130421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757011.

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

The square root of 1242130421 is about 35243.8706869719. The cubic root of 1242130421 is about 1074.9519851639.

Adding to 1242130421 its reverse (1240312421), we get a palindrome (2482442842).

The spelling of 1242130421 in words is "one billion, two hundred forty-two million, one hundred thirty thousand, four hundred twenty-one".