21401201401 has 2 divisors, whose sum is σ = 21401201402. Its totient is φ = 21401201400.

The previous prime is 21401201359. The next prime is 21401201411. The reversal of 21401201401 is 10410210412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11805039801 + 9596161600 = 108651^2 + 97960^2 .

It is a cyclic number.

It is not a de Polignac number, because 21401201401 - 2¹⁷ = 21401070329 is a prime.

It is a super-2 number, since 2×21401201401² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21401201411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700600700 + 10700600701.

It is an arithmetic number, because the mean of its divisors is an integer number (10700600701).

Almost surely, 2^21401201401 is an apocalyptic number.

It is an amenable number.

21401201401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401201401 is an equidigital number, since it uses as much as digits as its factorization.

21401201401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21401201401 its reverse (10410210412), we get a palindrome (31811411813).

The spelling of 21401201401 in words is "twenty-one billion, four hundred one million, two hundred one thousand, four hundred one".