1220217420 has 48 divisors (see below), whose sum is σ = 3424161888. Its totient is φ = 324672000.

The previous prime is 1220217419. The next prime is 1220217499. The reversal of 1220217420 is 247120221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5170 + ... + 49670.

It is an arithmetic number, because the mean of its divisors is an integer number (71336706).

Almost surely, 2^1220217420 is an apocalyptic number.

1220217420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220217420 is an abundant number, since it is smaller than the sum of its proper divisors (2203944468).

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

1220217420 is a wasteful number, since it uses less digits than its factorization.

1220217420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44970 (or 44968 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 1220217420 is about 34931.6106127387. The cubic root of 1220217420 is about 1068.5932017157.

Adding to 1220217420 its reverse (247120221), we get a palindrome (1467337641).

The spelling of 1220217420 in words is "one billion, two hundred twenty million, two hundred seventeen thousand, four hundred twenty".