21021120020001 has 8 divisors (see below), whose sum is σ = 28029968707104. Its totient is φ = 14013175673120.

The previous prime is 21021120019979. The next prime is 21021120020027. The reversal of 21021120020001 is 10002002112012.

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 21021120020001 - 2¹⁵ = 21021119987233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021120020041) 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, 226030815 + ... + 226123796.

It is an arithmetic number, because the mean of its divisors is an integer number (3503746088388).

Almost surely, 2^{21021120020001} is an apocalyptic number.

It is an amenable number.

21021120020001 is a deficient number, since it is larger than the sum of its proper divisors (7008848687103).

21021120020001 is a wasteful number, since it uses less digits than its factorization.

21021120020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452170111.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21021120020001 its reverse (10002002112012), we get a palindrome (31023122132013).

The spelling of 21021120020001 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, twenty thousand, one".