21346266401 has 4 divisors (see below), whose sum is σ = 21400035732. Its totient is φ = 21292497072.

The previous prime is 21346266371. The next prime is 21346266413. The reversal of 21346266401 is 10466264312.

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 17157070225 + 4189196176 = 130985^2 + 64724^2 .

It is a cyclic number.

It is not a de Polignac number, because 21346266401 - 2³⁴ = 4166397217 is a prime.

It is a super-2 number, since 2×21346266401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21346266451) 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, 26884070 + ... + 26884863.

It is an arithmetic number, because the mean of its divisors is an integer number (5350008933).

Almost surely, 2^21346266401 is an apocalyptic number.

It is an amenable number.

21346266401 is a deficient number, since it is larger than the sum of its proper divisors (53769331).

21346266401 is an equidigital number, since it uses as much as digits as its factorization.

21346266401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53769330.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 21346266401 in words is "twenty-one billion, three hundred forty-six million, two hundred sixty-six thousand, four hundred one".