21011003212021 has 8 divisors (see below), whose sum is σ = 22250623691520. Its totient is φ = 19771791523008.

The previous prime is 21011003212007. The next prime is 21011003212093. The reversal of 21011003212021 is 12021230011012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011003212021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011003211986 and 21011003212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011003215021) 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, 102091791 + ... + 102297388.

It is an arithmetic number, because the mean of its divisors is an integer number (2781327961440).

Almost surely, 2^{21011003212021} is an apocalyptic number.

It is an amenable number.

21011003212021 is a deficient number, since it is larger than the sum of its proper divisors (1239620479499).

21011003212021 is a wasteful number, since it uses less digits than its factorization.

21011003212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204395243.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21011003212021 its reverse (12021230011012), we get a palindrome (33032233223033).

The spelling of 21011003212021 in words is "twenty-one trillion, eleven billion, three million, two hundred twelve thousand, twenty-one".