21021121101 has 12 divisors (see below), whose sum is σ = 29299762688. Its totient is φ = 13404771864.

The previous prime is 21021121081. The next prime is 21021121103. The reversal of 21021121101 is 10112112012.

It is not a de Polignac number, because 21021121101 - 2¹³ = 21021112909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021121103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6621325 + ... + 6624498.

Almost surely, 2^21021121101 is an apocalyptic number.

It is an amenable number.

21021121101 is a deficient number, since it is larger than the sum of its proper divisors (8278641587).

21021121101 is a wasteful number, since it uses less digits than its factorization.

21021121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13245872 (or 13245849 counting only the distinct ones).

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

Adding to 21021121101 its reverse (10112112012), we get a palindrome (31133233113).

The spelling of 21021121101 in words is "twenty-one billion, twenty-one million, one hundred twenty-one thousand, one hundred one".