21000150251 has 2 divisors, whose sum is σ = 21000150252. Its totient is φ = 21000150250.

The previous prime is 21000150221. The next prime is 21000150263. The reversal of 21000150251 is 15205100012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000150251 - 2²⁶ = 20933041387 is a prime.

It is not a weakly prime, because it can be changed into another prime (21000150211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500075125 + 10500075126.

It is an arithmetic number, because the mean of its divisors is an integer number (10500075126).

Almost surely, 2^21000150251 is an apocalyptic number.

21000150251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000150251 is an equidigital number, since it uses as much as digits as its factorization.

21000150251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100, while the sum is 17.

Adding to 21000150251 its reverse (15205100012), we get a palindrome (36205250263).

The spelling of 21000150251 in words is "twenty-one billion, one hundred fifty thousand, two hundred fifty-one".