21003452515234 has 40 divisors (see below), whose sum is σ = 36821796392988. Its totient is φ = 8984839943520.

The previous prime is 21003452515231. The next prime is 21003452515327. The reversal of 21003452515234 is 43251525430012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18849030353209 + 2154422162025 = 4341547^2 + 1467795^2 .

It is a super-2 number, since 2×21003452515234² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003452515193 and 21003452515202.

It is not an unprimeable number, because it can be changed into a prime (21003452515231) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1444537 + ... + 6640300.

Almost surely, 2^{21003452515234} is an apocalyptic number.

21003452515234 is a deficient number, since it is larger than the sum of its proper divisors (15818343877754).

21003452515234 is an frugal number, since it uses more digits than its factorization.

21003452515234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8085408 (or 8085387 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

Adding to 21003452515234 its reverse (43251525430012), we get a palindrome (64254977945246).

The spelling of 21003452515234 in words is "twenty-one trillion, three billion, four hundred fifty-two million, five hundred fifteen thousand, two hundred thirty-four".