21629864129 has 2 divisors, whose sum is σ = 21629864130. Its totient is φ = 21629864128.

The previous prime is 21629864111. The next prime is 21629864147. The reversal of 21629864129 is 92146892612.

It is a balanced prime because it is at equal distance from previous prime (21629864111) and next prime (21629864147).

It can be written as a sum of positive squares in only one way, i.e., 21564335104 + 65529025 = 146848^2 + 8095^2 .

It is a cyclic number.

It is not a de Polignac number, because 21629864129 - 2¹² = 21629860033 is a prime.

It is not a weakly prime, because it can be changed into another prime (21629864029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10814932064 + 10814932065.

It is an arithmetic number, because the mean of its divisors is an integer number (10814932065).

Almost surely, 2^21629864129 is an apocalyptic number.

It is an amenable number.

21629864129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21629864129 is an equidigital number, since it uses as much as digits as its factorization.

21629864129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The spelling of 21629864129 in words is "twenty-one billion, six hundred twenty-nine million, eight hundred sixty-four thousand, one hundred twenty-nine".