21121000101221 has 8 divisors (see below), whose sum is σ = 22050039672960. Its totient is φ = 20192855131152.

The previous prime is 21121000101209. The next prime is 21121000101233. The reversal of 21121000101221 is 12210100012112.

It is an interprime number because it is at equal distance from previous prime (21121000101209) and next prime (21121000101233).

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 21121000101221 - 2³⁰ = 21119926359397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21121000101196 and 21121000101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121000101121) 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, 223602161 + ... + 223696598.

It is an arithmetic number, because the mean of its divisors is an integer number (2756254959120).

Almost surely, 2^{21121000101221} is an apocalyptic number.

It is an amenable number.

21121000101221 is a deficient number, since it is larger than the sum of its proper divisors (929039571739).

21121000101221 is a wasteful number, since it uses less digits than its factorization.

21121000101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447300835.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21121000101221 its reverse (12210100012112), we get a palindrome (33331100113333).

The spelling of 21121000101221 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one thousand, two hundred twenty-one".