21152211121301 has 4 divisors (see below), whose sum is σ = 22779304284492. Its totient is φ = 19525117958112.

The previous prime is 21152211121213. The next prime is 21152211121319. The reversal of 21152211121301 is 10312111225112.

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 8917396412401 + 12234814708900 = 2986201^2 + 3497830^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21152211121301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152213121301) 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, 813546581576 + ... + 813546581601.

It is an arithmetic number, because the mean of its divisors is an integer number (5694826071123).

Almost surely, 2^{21152211121301} is an apocalyptic number.

It is an amenable number.

21152211121301 is a deficient number, since it is larger than the sum of its proper divisors (1627093163191).

21152211121301 is a wasteful number, since it uses less digits than its factorization.

21152211121301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627093163190.

The product of its (nonzero) digits is 240, while the sum is 23.

Adding to 21152211121301 its reverse (10312111225112), we get a palindrome (31464322346413).

The spelling of 21152211121301 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred eleven million, one hundred twenty-one thousand, three hundred one".