21212021011021 has 8 divisors (see below), whose sum is σ = 22255235161088. Its totient is φ = 20191241574000.

The previous prime is 21212021010997. The next prime is 21212021011099. The reversal of 21212021011021 is 12011012021212.

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 21212021011021 - 2²⁵ = 21211987456589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212021010986 and 21212021011004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212021011721) 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, 5608676325 + ... + 5608680106.

It is an arithmetic number, because the mean of its divisors is an integer number (2781904395136).

Almost surely, 2^{21212021011021} is an apocalyptic number.

It is an amenable number.

21212021011021 is a deficient number, since it is larger than the sum of its proper divisors (1043214150067).

21212021011021 is a wasteful number, since it uses less digits than its factorization.

21212021011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11217356523.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21212021011021 its reverse (12011012021212), we get a palindrome (33223033032233).

The spelling of 21212021011021 in words is "twenty-one trillion, two hundred twelve billion, twenty-one million, eleven thousand, twenty-one".