21407002069 has 2 divisors, whose sum is σ = 21407002070. Its totient is φ = 21407002068.

The previous prime is 21407002049. The next prime is 21407002079. The reversal of 21407002069 is 96020070412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16368131844 + 5038870225 = 127938^2 + 70985^2 .

It is a cyclic number.

It is not a de Polignac number, because 21407002069 - 2²³ = 21398613461 is a prime.

It is a super-2 number, since 2×21407002069² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21407002069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21407002049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10703501034 + 10703501035.

It is an arithmetic number, because the mean of its divisors is an integer number (10703501035).

Almost surely, 2^21407002069 is an apocalyptic number.

It is an amenable number.

21407002069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21407002069 is an equidigital number, since it uses as much as digits as its factorization.

21407002069 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 31.

The spelling of 21407002069 in words is "twenty-one billion, four hundred seven million, two thousand, sixty-nine".