1021221012120 has 64 divisors (see below), whose sum is σ = 3079058400000. Its totient is φ = 270957126528.

The previous prime is 1021221012089. The next prime is 1021221012157. The reversal of 1021221012120 is 212101221201.

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 1021221012120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21358470 + ... + 21406229.

It is an arithmetic number, because the mean of its divisors is an integer number (48110287500).

Almost surely, 2^{1021221012120} is an apocalyptic number.

1021221012120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021221012120 is an abundant number, since it is smaller than the sum of its proper divisors (2057837387880).

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

1021221012120 is a wasteful number, since it uses less digits than its factorization.

1021221012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42764912 (or 42764908 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1021221012120 its reverse (212101221201), we get a palindrome (1233322233321).

The spelling of 1021221012120 in words is "one trillion, twenty-one billion, two hundred twenty-one million, twelve thousand, one hundred twenty".