1213404220 has 48 divisors (see below), whose sum is σ = 3065448960. Its totient is φ = 394127424.

The previous prime is 1213404197. The next prime is 1213404221. The reversal of 1213404220 is 224043121.

It is a super-2 number, since 2×1213404220² = 2944699602227616800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213404221) 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, 225424 + ... + 230743.

It is an arithmetic number, because the mean of its divisors is an integer number (63863520).

Almost surely, 2^1213404220 is an apocalyptic number.

1213404220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213404220 is an abundant number, since it is smaller than the sum of its proper divisors (1852044740).

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

1213404220 is a wasteful number, since it uses less digits than its factorization.

1213404220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456202 (or 456200 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1213404220 is about 34833.9521157161. The cubic root of 1213404220 is about 1066.6006246004.

Adding to 1213404220 its reverse (224043121), we get a palindrome (1437447341).

The spelling of 1213404220 in words is "one billion, two hundred thirteen million, four hundred four thousand, two hundred twenty".