221021101001 has 32 divisors (see below), whose sum is σ = 241000704000. Its totient is φ = 202144187520.

The previous prime is 221021100983. The next prime is 221021101111. The reversal of 221021101001 is 100101120122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221021101001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021101501) 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, 12564230 + ... + 12581808.

It is an arithmetic number, because the mean of its divisors is an integer number (7531272000).

Almost surely, 2^221021101001 is an apocalyptic number.

It is an amenable number.

221021101001 is a deficient number, since it is larger than the sum of its proper divisors (19979602999).

221021101001 is a wasteful number, since it uses less digits than its factorization.

221021101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17909.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221021101001 its reverse (100101120122), we get a palindrome (321122221123).

The spelling of 221021101001 in words is "two hundred twenty-one billion, twenty-one million, one hundred one thousand, one".