1421213220 has 72 divisors (see below), whose sum is σ = 4926876864. Its totient is φ = 324848448.

The previous prime is 1421213191. The next prime is 1421213221. The reversal of 1421213220 is 223121241.

It is a happy number.

1421213220 is a `hidden beast` number, since 1 + 421 + 21 + 3 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1421213193 and 1421213202.

It is not an unprimeable number, because it can be changed into a prime (1421213221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 562714 + ... + 565233.

Almost surely, 2^1421213220 is an apocalyptic number.

1421213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1421213220 is an abundant number, since it is smaller than the sum of its proper divisors (3505663644).

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

1421213220 is a wasteful number, since it uses less digits than its factorization.

1421213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127969 (or 1127964 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1421213220 is about 37698.9816838598. The cubic root of 1421213220 is about 1124.3108787041.

Adding to 1421213220 its reverse (223121241), we get a palindrome (1644334461).

The spelling of 1421213220 in words is "one billion, four hundred twenty-one million, two hundred thirteen thousand, two hundred twenty".