21301725029 has 16 divisors (see below), whose sum is σ = 23508597504. Its totient is φ = 19176393600.

The previous prime is 21301725019. The next prime is 21301725079. The reversal of 21301725029 is 92052710312.

It is a de Polignac number, because none of the positive numbers 2^k-21301725029 is a prime.

It is a super-2 number, since 2×21301725029² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21301724986 and 21301725004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301725019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1865672 + ... + 1877054.

It is an arithmetic number, because the mean of its divisors is an integer number (1469287344).

Almost surely, 2^21301725029 is an apocalyptic number.

It is an amenable number.

21301725029 is a deficient number, since it is larger than the sum of its proper divisors (2206872475).

21301725029 is a wasteful number, since it uses less digits than its factorization.

21301725029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14948.

The product of its (nonzero) digits is 7560, while the sum is 32.

The spelling of 21301725029 in words is "twenty-one billion, three hundred one million, seven hundred twenty-five thousand, twenty-nine".