221002021001 has 4 divisors (see below), whose sum is σ = 221003319504. Its totient is φ = 221000722500.

The previous prime is 221002020971. The next prime is 221002021003. The reversal of 221002021001 is 100120200122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100120200122 = 2 ⋅50060100061.

It is a cyclic number.

It is not a de Polignac number, because 221002021001 - 2²⁶ = 220934912137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221002021003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347075 + ... + 749976.

It is an arithmetic number, because the mean of its divisors is an integer number (55250829876).

Almost surely, 2^221002021001 is an apocalyptic number.

It is an amenable number.

221002021001 is a deficient number, since it is larger than the sum of its proper divisors (1298503).

221002021001 is a wasteful number, since it uses less digits than its factorization.

221002021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298502.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 221002021001 its reverse (100120200122), we get a palindrome (321122221123).

The spelling of 221002021001 in words is "two hundred twenty-one billion, two million, twenty-one thousand, one".