1221021030220 has 12 divisors (see below), whose sum is σ = 2564144163504. Its totient is φ = 488408412080.

The previous prime is 1221021030209. The next prime is 1221021030277. The reversal of 1221021030220 is 220301201221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1221021030194 and 1221021030203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30525525736 + ... + 30525525775.

It is an arithmetic number, because the mean of its divisors is an integer number (213678680292).

Almost surely, 2^{1221021030220} is an apocalyptic number.

1221021030220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221021030220 is an abundant number, since it is smaller than the sum of its proper divisors (1343123133284).

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

1221021030220 is a wasteful number, since it uses less digits than its factorization.

1221021030220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61051051520 (or 61051051518 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 1221021030220 its reverse (220301201221), we get a palindrome (1441322231441).

The spelling of 1221021030220 in words is "one trillion, two hundred twenty-one billion, twenty-one million, thirty thousand, two hundred twenty".