21405150337 has 2 divisors, whose sum is σ = 21405150338. Its totient is φ = 21405150336.

The previous prime is 21405150257. The next prime is 21405150391. The reversal of 21405150337 is 73305150412.

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., 19262941681 + 2142208656 = 138791^2 + 46284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21405150337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21405150299 and 21405150308.

It is not a weakly prime, because it can be changed into another prime (21405153337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702575168 + 10702575169.

It is an arithmetic number, because the mean of its divisors is an integer number (10702575169).

Almost surely, 2^21405150337 is an apocalyptic number.

It is an amenable number.

21405150337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21405150337 is an equidigital number, since it uses as much as digits as its factorization.

21405150337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 31.

The spelling of 21405150337 in words is "twenty-one billion, four hundred five million, one hundred fifty thousand, three hundred thirty-seven".