21503514210452 has 6 divisors (see below), whose sum is σ = 37631149868298. Its totient is φ = 10751757105224.

The previous prime is 21503514210433. The next prime is 21503514210481. The reversal of 21503514210452 is 25401241530512.

It can be written as a sum of positive squares in only one way, i.e., 13446624977296 + 8056889233156 = 3666964^2 + 2838466^2 .

It is a super-2 number, since 2×21503514210452² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2687939276303 + ... + 2687939276310.

It is an arithmetic number, because the mean of its divisors is an integer number (6271858311383).

Almost surely, 2^{21503514210452} is an apocalyptic number.

It is an amenable number.

21503514210452 is a deficient number, since it is larger than the sum of its proper divisors (16127635657846).

21503514210452 is a wasteful number, since it uses less digits than its factorization.

21503514210452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375878552617 (or 5375878552615 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 21503514210452 its reverse (25401241530512), we get a palindrome (46904755740964).

The spelling of 21503514210452 in words is "twenty-one trillion, five hundred three billion, five hundred fourteen million, two hundred ten thousand, four hundred fifty-two".