221101021021 has 8 divisors (see below), whose sum is σ = 239087963520. Its totient is φ = 203667523008.

The previous prime is 221101021007. The next prime is 221101021051. The reversal of 221101021021 is 120120101122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221101021021 - 2⁷ = 221101020893 is a prime.

It is a super-2 number, since 2×221101021021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221101020992 and 221101021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101021051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138360291 + ... + 138361888.

It is an arithmetic number, because the mean of its divisors is an integer number (29885995440).

Almost surely, 2^221101021021 is an apocalyptic number.

It is an amenable number.

221101021021 is a deficient number, since it is larger than the sum of its proper divisors (17986942499).

221101021021 is a wasteful number, since it uses less digits than its factorization.

221101021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276722243.

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

Adding to 221101021021 its reverse (120120101122), we get a palindrome (341221122143).

The spelling of 221101021021 in words is "two hundred twenty-one billion, one hundred one million, twenty-one thousand, twenty-one".