21133020947 has 2 divisors, whose sum is σ = 21133020948. Its totient is φ = 21133020946.

The previous prime is 21133020907. The next prime is 21133021003. The reversal of 21133020947 is 74902033112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21133020947 - 2¹⁶ = 21132955411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21133020907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566510473 + 10566510474.

It is an arithmetic number, because the mean of its divisors is an integer number (10566510474).

Almost surely, 2^21133020947 is an apocalyptic number.

21133020947 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133020947 is an equidigital number, since it uses as much as digits as its factorization.

21133020947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The spelling of 21133020947 in words is "twenty-one billion, one hundred thirty-three million, twenty thousand, nine hundred forty-seven".