1021011100221 has 32 divisors (see below), whose sum is σ = 1589924102400. Its totient is φ = 582572722368.

The previous prime is 1021011100189. The next prime is 1021011100243. The reversal of 1021011100221 is 1220011101201.

It is not a de Polignac number, because 1021011100221 - 2⁵ = 1021011100189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021011100197 and 1021011100206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021011100121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36186 + ... + 1429451.

It is an arithmetic number, because the mean of its divisors is an integer number (49685128200).

Almost surely, 2^{1021011100221} is an apocalyptic number.

It is an amenable number.

1021011100221 is a deficient number, since it is larger than the sum of its proper divisors (568913002179).

1021011100221 is an equidigital number, since it uses as much as digits as its factorization.

1021011100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466338 (or 1466324 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1021011100221 its reverse (1220011101201), we get a palindrome (2241022201422).

The spelling of 1021011100221 in words is "one trillion, twenty-one billion, eleven million, one hundred thousand, two hundred twenty-one".