1212553420 has 48 divisors (see below), whose sum is σ = 2744784000. Its totient is φ = 447296256.

The previous prime is 1212553351. The next prime is 1212553421. The reversal of 1212553420 is 243552121.

It is not an unprimeable number, because it can be changed into a prime (1212553421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518574 + ... + 520906.

It is an arithmetic number, because the mean of its divisors is an integer number (57183000).

Almost surely, 2^1212553420 is an apocalyptic number.

1212553420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212553420 is an abundant number, since it is smaller than the sum of its proper divisors (1532230580).

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

1212553420 is a wasteful number, since it uses less digits than its factorization.

1212553420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354 (or 4352 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1212553420 is about 34821.7377510083. The cubic root of 1212553420 is about 1066.3512776326.

The spelling of 1212553420 in words is "one billion, two hundred twelve million, five hundred fifty-three thousand, four hundred twenty".