21529119945 has 32 divisors (see below), whose sum is σ = 34739429760. Its totient is φ = 11384801280.

The previous prime is 21529119943. The next prime is 21529119949. The reversal of 21529119945 is 54991192512.

It is a happy number.

It is not a de Polignac number, because 21529119945 - 2¹ = 21529119943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21529119894 and 21529119903.

It is not an unprimeable number, because it can be changed into a prime (21529119943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1705497 + ... + 1718073.

It is an arithmetic number, because the mean of its divisors is an integer number (1085607180).

Almost surely, 2^21529119945 is an apocalyptic number.

It is an amenable number.

21529119945 is a deficient number, since it is larger than the sum of its proper divisors (13210309815).

21529119945 is a wasteful number, since it uses less digits than its factorization.

21529119945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13545.

The product of its digits is 291600, while the sum is 48.

The spelling of 21529119945 in words is "twenty-one billion, five hundred twenty-nine million, one hundred nineteen thousand, nine hundred forty-five".