21389020007 has 2 divisors, whose sum is σ = 21389020008. Its totient is φ = 21389020006.

The previous prime is 21389019959. The next prime is 21389020021. The reversal of 21389020007 is 70002098312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21389020007 - 2¹⁶ = 21388954471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21389010007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694510003 + 10694510004.

It is an arithmetic number, because the mean of its divisors is an integer number (10694510004).

Almost surely, 2^21389020007 is an apocalyptic number.

21389020007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21389020007 is an equidigital number, since it uses as much as digits as its factorization.

21389020007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

The spelling of 21389020007 in words is "twenty-one billion, three hundred eighty-nine million, twenty thousand, seven".