21739130429 has 2 divisors, whose sum is σ = 21739130430. Its totient is φ = 21739130428.

The previous prime is 21739130419. The next prime is 21739130447. The reversal of 21739130429 is 92403193712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20596555225 + 1142575204 = 143515^2 + 33802^2 .

It is a cyclic number.

It is not a de Polignac number, because 21739130429 - 2²⁰ = 21738081853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21739130419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10869565214 + 10869565215.

It is an arithmetic number, because the mean of its divisors is an integer number (10869565215).

Almost surely, 2^21739130429 is an apocalyptic number.

It is an amenable number.

21739130429 is a deficient number, since it is larger than the sum of its proper divisors (1).

21739130429 is an equidigital number, since it uses as much as digits as its factorization.

21739130429 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The spelling of 21739130429 in words is "twenty-one billion, seven hundred thirty-nine million, one hundred thirty thousand, four hundred twenty-nine".