21029372149 has 2 divisors, whose sum is σ = 21029372150. Its totient is φ = 21029372148.

The previous prime is 21029372141. The next prime is 21029372201. The reversal of 21029372149 is 94127392012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11790702225 + 9238669924 = 108585^2 + 96118^2 .

It is a cyclic number.

It is not a de Polignac number, because 21029372149 - 2³ = 21029372141 is a prime.

It is a super-2 number, since 2×21029372149² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21029372141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10514686074 + 10514686075.

It is an arithmetic number, because the mean of its divisors is an integer number (10514686075).

Almost surely, 2^21029372149 is an apocalyptic number.

It is an amenable number.

21029372149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21029372149 is an equidigital number, since it uses as much as digits as its factorization.

21029372149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 21029372149 in words is "twenty-one billion, twenty-nine million, three hundred seventy-two thousand, one hundred forty-nine".