21113012202101 has 4 divisors (see below), whose sum is σ = 21154491597900. Its totient is φ = 21071532806304.

The previous prime is 21113012202077. The next prime is 21113012202143. The reversal of 21113012202101 is 10120221031112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8318984590225 + 12794027611876 = 2884265^2 + 3576874^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113012202101 - 2²² = 21113008007797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113012202101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113012222101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20739697136 + ... + 20739698153.

It is an arithmetic number, because the mean of its divisors is an integer number (5288622899475).

Almost surely, 2^{21113012202101} is an apocalyptic number.

It is an amenable number.

21113012202101 is a deficient number, since it is larger than the sum of its proper divisors (41479395799).

21113012202101 is an equidigital number, since it uses as much as digits as its factorization.

21113012202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41479395798.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21113012202101 its reverse (10120221031112), we get a palindrome (31233233233213).

The spelling of 21113012202101 in words is "twenty-one trillion, one hundred thirteen billion, twelve million, two hundred two thousand, one hundred one".