10021000221091 has 4 divisors (see below), whose sum is σ = 10021043743384. Its totient is φ = 10020956698800.

The previous prime is 10021000221083. The next prime is 10021000221103. The reversal of 10021000221091 is 19012200012001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10021000221091 - 2³ = 10021000221083 is a prime.

It is a super-2 number, since 2×10021000221091² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10021000221061) 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, 21413925 + ... + 21876886.

It is an arithmetic number, because the mean of its divisors is an integer number (2505260935846).

Almost surely, 2^{10021000221091} is an apocalyptic number.

10021000221091 is a deficient number, since it is larger than the sum of its proper divisors (43522293).

10021000221091 is an equidigital number, since it uses as much as digits as its factorization.

10021000221091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43522292.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 10021000221091 its reverse (19012200012001), we get a palindrome (29033200233092).

The spelling of 10021000221091 in words is "ten trillion, twenty-one billion, two hundred twenty-one thousand, ninety-one".