21121002101 has 8 divisors (see below), whose sum is σ = 21325361184. Its totient is φ = 20916772240.

The previous prime is 21121002083. The next prime is 21121002107. The reversal of 21121002101 is 10120012112.

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-21121002101 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 (21121002107) 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, 314006 + ... + 375288.

It is an arithmetic number, because the mean of its divisors is an integer number (2665670148).

Almost surely, 2^21121002101 is an apocalyptic number.

It is an amenable number.

21121002101 is a deficient number, since it is larger than the sum of its proper divisors (204359083).

21121002101 is a wasteful number, since it uses less digits than its factorization.

21121002101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64611.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21121002101 its reverse (10120012112), we get a palindrome (31241014213).

The spelling of 21121002101 in words is "twenty-one billion, one hundred twenty-one million, two thousand, one hundred one".