1220021012100 has 144 divisors (see below), whose sum is σ = 3851248879296. Its totient is φ = 295730496000.

The previous prime is 1220021012081. The next prime is 1220021012131. The reversal of 1220021012100 is 12101200221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46916302 + ... + 46942298.

It is an arithmetic number, because the mean of its divisors is an integer number (26744783884).

Almost surely, 2^{1220021012100} is an apocalyptic number.

1220021012100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220021012100 is an abundant number, since it is smaller than the sum of its proper divisors (2631227867196).

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

1220021012100 is a wasteful number, since it uses less digits than its factorization.

1220021012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40246 (or 40239 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1220021012100 its reverse (12101200221), we get a palindrome (1232122212321).

The spelling of 1220021012100 in words is "one trillion, two hundred twenty billion, twenty-one million, twelve thousand, one hundred".