1042121220 has 72 divisors (see below), whose sum is σ = 3394347264. Its totient is φ = 238198464.

The previous prime is 1042121219. The next prime is 1042121239. The reversal of 1042121220 is 221212401.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1042121220.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174292 + ... + 180171.

It is an arithmetic number, because the mean of its divisors is an integer number (47143712).

Almost surely, 2^1042121220 is an apocalyptic number.

1042121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1042121220 is an abundant number, since it is smaller than the sum of its proper divisors (2352226044).

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

1042121220 is a wasteful number, since it uses less digits than its factorization.

1042121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354489 (or 354480 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 1042121220 is about 32281.9023603009. The cubic root of 1042121220 is about 1013.8477610300.

Adding to 1042121220 its reverse (221212401), we get a palindrome (1263333621).

The spelling of 1042121220 in words is "one billion, forty-two million, one hundred twenty-one thousand, two hundred twenty".