21012011202101 has 16 divisors (see below), whose sum is σ = 21701639700480. Its totient is φ = 20323124789040.

The previous prime is 21012011202079. The next prime is 21012011202109. The reversal of 21012011202101 is 10120211021012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012011202101 is a prime.

It is a super-2 number, since 2×21012011202101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012011202109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 455304710 + ... + 455350856.

It is an arithmetic number, because the mean of its divisors is an integer number (1356352481280).

Almost surely, 2^{21012011202101} is an apocalyptic number.

It is an amenable number.

21012011202101 is a deficient number, since it is larger than the sum of its proper divisors (689628498379).

21012011202101 is a wasteful number, since it uses less digits than its factorization.

21012011202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53864.

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

Adding to 21012011202101 its reverse (10120211021012), we get a palindrome (31132222223113).

The spelling of 21012011202101 in words is "twenty-one trillion, twelve billion, eleven million, two hundred two thousand, one hundred one".