1213422420 has 96 divisors (see below), whose sum is σ = 3894928128. Its totient is φ = 276498432.

The previous prime is 1213422407. The next prime is 1213422421. The reversal of 1213422420 is 242243121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213422421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137254 + ... + 145826.

It is an arithmetic number, because the mean of its divisors is an integer number (40572168).

Almost surely, 2^1213422420 is an apocalyptic number.

1213422420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213422420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1947464064).

1213422420 is an abundant number, since it is smaller than the sum of its proper divisors (2681505708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213422420 is a wasteful number, since it uses less digits than its factorization.

1213422420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8929 (or 8927 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1213422420 is about 34834.2133541149. The cubic root of 1213422420 is about 1066.6059572653.

Adding to 1213422420 its reverse (242243121), we get a palindrome (1455665541).

The spelling of 1213422420 in words is "one billion, two hundred thirteen million, four hundred twenty-two thousand, four hundred twenty".