1213142421 has 16 divisors (see below), whose sum is σ = 1669966848. Its totient is φ = 782769600.

The previous prime is 1213142363. The next prime is 1213142443. The reversal of 1213142421 is 1242413121.

It is not a de Polignac number, because 1213142421 - 2¹⁴ = 1213126037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213142461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7410 + ... + 49811.

It is an arithmetic number, because the mean of its divisors is an integer number (104372928).

Almost surely, 2^1213142421 is an apocalyptic number.

It is an amenable number.

1213142421 is a deficient number, since it is larger than the sum of its proper divisors (456824427).

1213142421 is a wasteful number, since it uses less digits than its factorization.

1213142421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57452.

The product of its digits is 384, while the sum is 21.

The square root of 1213142421 is about 34830.1940993730. The cubic root of 1213142421 is about 1066.5239106587.

Adding to 1213142421 its reverse (1242413121), we get a palindrome (2455555542).

The spelling of 1213142421 in words is "one billion, two hundred thirteen million, one hundred forty-two thousand, four hundred twenty-one".