1021020101221 has 16 divisors (see below), whose sum is σ = 1033057293120. Its totient is φ = 1009040014080.

The previous prime is 1021020101203. The next prime is 1021020101239. The reversal of 1021020101221 is 1221010201201.

It is an interprime number because it is at equal distance from previous prime (1021020101203) and next prime (1021020101239).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021020101221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021020101261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55351626 + ... + 55370068.

It is an arithmetic number, because the mean of its divisors is an integer number (64566080820).

Almost surely, 2^{1021020101221} is an apocalyptic number.

It is an amenable number.

1021020101221 is a deficient number, since it is larger than the sum of its proper divisors (12037191899).

1021020101221 is a wasteful number, since it uses less digits than its factorization.

1021020101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19956.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021020101221 its reverse (1221010201201), we get a palindrome (2242030302422).

The spelling of 1021020101221 in words is "one trillion, twenty-one billion, twenty million, one hundred one thousand, two hundred twenty-one".