21111012120001 has 8 divisors (see below), whose sum is σ = 22635783659520. Its totient is φ = 19617679169088.

The previous prime is 21111012119999. The next prime is 21111012120053. The reversal of 21111012120001 is 10002121011112.

It is a happy number.

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 21111012120001 - 2¹ = 21111012119999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111012100001) 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, 7859645761 + ... + 7859648446.

It is an arithmetic number, because the mean of its divisors is an integer number (2829472957440).

Almost surely, 2^{21111012120001} is an apocalyptic number.

It is an amenable number.

21111012120001 is a deficient number, since it is larger than the sum of its proper divisors (1524771539519).

21111012120001 is a wasteful number, since it uses less digits than its factorization.

21111012120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15719294303.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21111012120001 its reverse (10002121011112), we get a palindrome (31113133131113).

The spelling of 21111012120001 in words is "twenty-one trillion, one hundred eleven billion, twelve million, one hundred twenty thousand, one".