1211063420 has 144 divisors (see below), whose sum is σ = 3139587360. Its totient is φ = 390168576.

The previous prime is 1211063419. The next prime is 1211063449. The reversal of 1211063420 is 243601121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1211063392 and 1211063401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3593492 + ... + 3593828.

It is an arithmetic number, because the mean of its divisors is an integer number (21802690).

Almost surely, 2^1211063420 is an apocalyptic number.

1211063420 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 1211063420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1569793680).

1211063420 is an abundant number, since it is smaller than the sum of its proper divisors (1928523940).

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

1211063420 is a wasteful number, since it uses less digits than its factorization.

1211063420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1211063420 is about 34800.3364926260. The cubic root of 1211063420 is about 1065.9143169107.

Adding to 1211063420 its reverse (243601121), we get a palindrome (1454664541).

The spelling of 1211063420 in words is "one billion, two hundred eleven million, sixty-three thousand, four hundred twenty".