1020220021221 has 8 divisors (see below), whose sum is σ = 1419436551360. Its totient is φ = 650575085952.

The previous prime is 1020220021211. The next prime is 1020220021231. The reversal of 1020220021221 is 1221200220201.

It is an interprime number because it is at equal distance from previous prime (1020220021211) and next prime (1020220021231).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1020220021221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020220021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020220021201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7392898636 + ... + 7392898773.

It is an arithmetic number, because the mean of its divisors is an integer number (177429568920).

Almost surely, 2^{1020220021221} is an apocalyptic number.

It is an amenable number.

1020220021221 is a deficient number, since it is larger than the sum of its proper divisors (399216530139).

1020220021221 is a wasteful number, since it uses less digits than its factorization.

1020220021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14785797435.

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

Adding to 1020220021221 its reverse (1221200220201), we get a palindrome (2241420241422).

The spelling of 1020220021221 in words is "one trillion, twenty billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".