221021012001021 has 8 divisors (see below), whose sum is σ = 310204929124320. Its totient is φ = 139592218105872.

The previous prime is 221021012001017. The next prime is 221021012001073. The reversal of 221021012001021 is 120100210120122.

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

It is not a de Polignac number, because 221021012001021 - 2² = 221021012001017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021012001421) 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, 1938780806970 + ... + 1938780807083.

It is an arithmetic number, because the mean of its divisors is an integer number (38775616140540).

Almost surely, 2^{221021012001021} is an apocalyptic number.

It is an amenable number.

221021012001021 is a deficient number, since it is larger than the sum of its proper divisors (89183917123299).

221021012001021 is a wasteful number, since it uses less digits than its factorization.

221021012001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877561614075.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221021012001021 its reverse (120100210120122), we get a palindrome (341121222121143).

The spelling of 221021012001021 in words is "two hundred twenty-one trillion, twenty-one billion, twelve million, one thousand, twenty-one".