1021012222221 has 6 divisors (see below), whose sum is σ = 1474795432110. Its totient is φ = 680674814808.

The previous prime is 1021012222193. The next prime is 1021012222271. The reversal of 1021012222221 is 1222222101201.

It is a happy number.

1021012222221 is a `hidden beast` number, since 1 + 0 + 210 + 12 + 222 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 519480562500 + 501531659721 = 720750^2 + 708189^2 .

It is not a de Polignac number, because 1021012222221 - 2⁹ = 1021012221709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021012222194 and 1021012222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021012222271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56722901226 + ... + 56722901243.

It is an arithmetic number, because the mean of its divisors is an integer number (245799238685).

Almost surely, 2^{1021012222221} is an apocalyptic number.

It is an amenable number.

1021012222221 is a deficient number, since it is larger than the sum of its proper divisors (453783209889).

1021012222221 is a wasteful number, since it uses less digits than its factorization.

1021012222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113445802475 (or 113445802472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1021012222221 its reverse (1222222101201), we get a palindrome (2243234323422).

The spelling of 1021012222221 in words is "one trillion, twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".