21523145034 has 16 divisors (see below), whose sum is σ = 43058427840. Its totient is φ = 7172358720.

The previous prime is 21523145011. The next prime is 21523145053. The reversal of 21523145034 is 43054132512.

It is a super-2 number, since 2×21523145034² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21523144992 and 21523145010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482607 + ... + 525314.

It is an arithmetic number, because the mean of its divisors is an integer number (2691151740).

Almost surely, 2^21523145034 is an apocalyptic number.

21523145034 is an abundant number, since it is smaller than the sum of its proper divisors (21535282806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21523145034 is a wasteful number, since it uses less digits than its factorization.

21523145034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011485.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21523145034 its reverse (43054132512), we get a palindrome (64577277546).

The spelling of 21523145034 in words is "twenty-one billion, five hundred twenty-three million, one hundred forty-five thousand, thirty-four".