1020212021221 has 16 divisors (see below), whose sum is σ = 1033192843200. Its totient is φ = 1007289712000.

The previous prime is 1020212021119. The next prime is 1020212021239. The reversal of 1020212021221 is 1221202120201.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1020212021221 - 2¹⁷ = 1020211890149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020212021195 and 1020212021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020212021281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206895126 + ... + 206900056.

It is an arithmetic number, because the mean of its divisors is an integer number (64574552700).

Almost surely, 2^{1020212021221} is an apocalyptic number.

It is an amenable number.

1020212021221 is a deficient number, since it is larger than the sum of its proper divisors (12980821979).

1020212021221 is a wasteful number, since it uses less digits than its factorization.

1020212021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10340.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1020212021221 its reverse (1221202120201), we get a palindrome (2241414141422).

The spelling of 1020212021221 in words is "one trillion, twenty billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".