1020021212221 has 32 divisors (see below), whose sum is σ = 1213840080000. Its totient is φ = 846700968960.

The previous prime is 1020021212149. The next prime is 1020021212239. The reversal of 1020021212221 is 1222121200201.

It is a happy number.

It is not a de Polignac number, because 1020021212221 - 2¹³ = 1020021204029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020021212195 and 1020021212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020021212921) 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 31 ways as a sum of consecutive naturals, for example, 3300825 + ... + 3596593.

It is an arithmetic number, because the mean of its divisors is an integer number (37932502500).

Almost surely, 2^{1020021212221} is an apocalyptic number.

1020021212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1020021212221 is a deficient number, since it is larger than the sum of its proper divisors (193818867779).

1020021212221 is a wasteful number, since it uses less digits than its factorization.

1020021212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296397.

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

Adding to 1020021212221 its reverse (1222121200201), we get a palindrome (2242142412422).

The spelling of 1020021212221 in words is "one trillion, twenty billion, twenty-one million, two hundred twelve thousand, two hundred twenty-one".