21121102120001 has 8 divisors (see below), whose sum is σ = 22745839092480. Its totient is φ = 19496370406032.

The previous prime is 21121102119839. The next prime is 21121102120033. The reversal of 21121102120001 is 10002120112112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21121102120001 is a prime.

It is a super-2 number, since 2×21121102120001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121102120051) 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, 12089030 + ... + 13725408.

It is an arithmetic number, because the mean of its divisors is an integer number (2843229886560).

Almost surely, 2^{21121102120001} is an apocalyptic number.

It is an amenable number.

21121102120001 is a deficient number, since it is larger than the sum of its proper divisors (1624736972479).

21121102120001 is a wasteful number, since it uses less digits than its factorization.

21121102120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2629255.

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

Adding to 21121102120001 its reverse (10002120112112), we get a palindrome (31123222232113).

The spelling of 21121102120001 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, one hundred twenty thousand, one".