21021101121 has 8 divisors (see below), whose sum is σ = 28029765024. Its totient is φ = 14013252320.

The previous prime is 21021101107. The next prime is 21021101141. The reversal of 21021101121 is 12110112012.

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 21021101121 - 2¹⁸ = 21020838977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021101097 and 21021101106.

It is not an unprimeable number, because it can be changed into a prime (21021101141) 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, 140820 + ... + 248741.

It is an arithmetic number, because the mean of its divisors is an integer number (3503720628).

Almost surely, 2^21021101121 is an apocalyptic number.

It is an amenable number.

21021101121 is a deficient number, since it is larger than the sum of its proper divisors (7008663903).

21021101121 is a wasteful number, since it uses less digits than its factorization.

21021101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407551.

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

Adding to 21021101121 its reverse (12110112012), we get a palindrome (33131213133).

The spelling of 21021101121 in words is "twenty-one billion, twenty-one million, one hundred one thousand, one hundred twenty-one".