1220120221000 has 32 divisors (see below), whose sum is σ = 2855081319480. Its totient is φ = 488048088000.

The previous prime is 1220120220973. The next prime is 1220120221043. The reversal of 1220120221000 is 1220210221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 253937382084 + 966182838916 = 503922^2 + 982946^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610059111 + ... + 610061110.

Almost surely, 2^{1220120221000} is an apocalyptic number.

1220120221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220120221000 is an abundant number, since it is smaller than the sum of its proper divisors (1634961098480).

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

1220120221000 is a wasteful number, since it uses less digits than its factorization.

1220120221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220120242 (or 1220120228 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1220120221000 its reverse (1220210221), we get a palindrome (1221340431221).

The spelling of 1220120221000 in words is "one trillion, two hundred twenty billion, one hundred twenty million, two hundred twenty-one thousand".