21261011013201 has 8 divisors (see below), whose sum is σ = 28348925646880. Its totient is φ = 14173551860832.

The previous prime is 21261011013167. The next prime is 21261011013269. The reversal of 21261011013201 is 10231011016212.

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

It is not a de Polignac number, because 21261011013201 - 2¹⁷ = 21261010882129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21261011013601) 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, 113761396 + ... + 113948133.

It is an arithmetic number, because the mean of its divisors is an integer number (3543615705860).

Almost surely, 2^{21261011013201} is an apocalyptic number.

It is an amenable number.

21261011013201 is a deficient number, since it is larger than the sum of its proper divisors (7087914633679).

21261011013201 is a wasteful number, since it uses less digits than its factorization.

21261011013201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227740655.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21261011013201 its reverse (10231011016212), we get a palindrome (31492022029413).

The spelling of 21261011013201 in words is "twenty-one trillion, two hundred sixty-one billion, eleven million, thirteen thousand, two hundred one".