21211022407 has 2 divisors, whose sum is σ = 21211022408. Its totient is φ = 21211022406.

The previous prime is 21211022387. The next prime is 21211022431. The reversal of 21211022407 is 70422011212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211022407 - 2¹¹ = 21211020359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211020407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605511203 + 10605511204.

It is an arithmetic number, because the mean of its divisors is an integer number (10605511204).

Almost surely, 2^21211022407 is an apocalyptic number.

21211022407 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211022407 is an equidigital number, since it uses as much as digits as its factorization.

21211022407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 21211022407 its reverse (70422011212), we get a palindrome (91633033619).

The spelling of 21211022407 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, four hundred seven".