21110120021001 has 8 divisors (see below), whose sum is σ = 30705629121504. Its totient is φ = 12794012133920.

The previous prime is 21110120020999. The next prime is 21110120021009. The reversal of 21110120021001 is 10012002101112.

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 21110120021001 - 2¹ = 21110120020999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21110120021009) 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, 319850303316 + ... + 319850303381.

It is an arithmetic number, because the mean of its divisors is an integer number (3838203640188).

Almost surely, 2^{21110120021001} is an apocalyptic number.

It is an amenable number.

21110120021001 is a deficient number, since it is larger than the sum of its proper divisors (9595509100503).

21110120021001 is a wasteful number, since it uses less digits than its factorization.

21110120021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639700606711.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21110120021001 its reverse (10012002101112), we get a palindrome (31122122122113).

The spelling of 21110120021001 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty million, twenty-one thousand, one".