21214232066261 has 8 divisors (see below), whose sum is σ = 22903068885144. Its totient is φ = 19533534220800.

The previous prime is 21214232066213. The next prime is 21214232066273. The reversal of 21214232066261 is 16266023241212.

It can be written as a sum of positive squares in 4 ways, for example, as 7035384904900 + 14178847161361 = 2652430^2 + 3765481^2 .

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 21214232066261 - 2⁶ = 21214232066197 is a prime.

It is a super-2 number, since 2×21214232066261² (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 (21214232066201) 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, 2034737936 + ... + 2034748361.

It is an arithmetic number, because the mean of its divisors is an integer number (2862883610643).

Almost surely, 2^{21214232066261} is an apocalyptic number.

It is an amenable number.

21214232066261 is a deficient number, since it is larger than the sum of its proper divisors (1688836818883).

21214232066261 is a wasteful number, since it uses less digits than its factorization.

21214232066261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069486711.

The product of its (nonzero) digits is 82944, while the sum is 38.

The spelling of 21214232066261 in words is "twenty-one trillion, two hundred fourteen billion, two hundred thirty-two million, sixty-six thousand, two hundred sixty-one".