21011001012021 has 8 divisors (see below), whose sum is σ = 28033975167264. Its totient is φ = 13997680432400.

The previous prime is 21011001011993. The next prime is 21011001012061. The reversal of 21011001012021 is 12021010011012.

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 21011001012021 - 2⁹ = 21011001011509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011001011988 and 21011001012006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011001012061) 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, 2413388826 + ... + 2413397531.

It is an arithmetic number, because the mean of its divisors is an integer number (3504246895908).

Almost surely, 2^{21011001012021} is an apocalyptic number.

It is an amenable number.

21011001012021 is a deficient number, since it is larger than the sum of its proper divisors (7022974155243).

21011001012021 is a wasteful number, since it uses less digits than its factorization.

21011001012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4826787811.

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

Adding to 21011001012021 its reverse (12021010011012), we get a palindrome (33032011023033).

The spelling of 21011001012021 in words is "twenty-one trillion, eleven billion, one million, twelve thousand, twenty-one".