1211452420 has 24 divisors (see below), whose sum is σ = 2606101848. Its totient is φ = 472761600.

The previous prime is 1211452399. The next prime is 1211452423. The reversal of 1211452420 is 242541121.

It can be written as a sum of positive squares in 4 ways, for example, as 187580416 + 1023872004 = 13696^2 + 31998^2 .

It is a super-3 number, since 3×1211452420³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211452391 and 1211452400.

It is not an unprimeable number, because it can be changed into a prime (1211452423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 737871 + ... + 739510.

It is an arithmetic number, because the mean of its divisors is an integer number (108587577).

Almost surely, 2^1211452420 is an apocalyptic number.

1211452420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211452420 is an abundant number, since it is smaller than the sum of its proper divisors (1394649428).

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

1211452420 is a wasteful number, since it uses less digits than its factorization.

1211452420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477431 (or 1477429 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1211452420 is about 34805.9250703095. The cubic root of 1211452420 is about 1066.0284304728.

Adding to 1211452420 its reverse (242541121), we get a palindrome (1453993541).

It can be divided in two parts, 121 and 1452420, that added together give a palindrome (1452541).

The spelling of 1211452420 in words is "one billion, two hundred eleven million, four hundred fifty-two thousand, four hundred twenty".