21521034414452 has 6 divisors (see below), whose sum is σ = 37661810225298. Its totient is φ = 10760517207224.

The previous prime is 21521034414377. The next prime is 21521034414469. The reversal of 21521034414452 is 25441443012512.

It can be written as a sum of positive squares in only one way, i.e., 21032900234896 + 488134179556 = 4586164^2 + 698666^2 .

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, 2690129301803 + ... + 2690129301810.

It is an arithmetic number, because the mean of its divisors is an integer number (6276968370883).

Almost surely, 2^{21521034414452} is an apocalyptic number.

It is an amenable number.

21521034414452 is a deficient number, since it is larger than the sum of its proper divisors (16140775810846).

21521034414452 is a wasteful number, since it uses less digits than its factorization.

21521034414452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5380258603617 (or 5380258603615 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 38.

Adding to 21521034414452 its reverse (25441443012512), we get a palindrome (46962477426964).

The spelling of 21521034414452 in words is "twenty-one trillion, five hundred twenty-one billion, thirty-four million, four hundred fourteen thousand, four hundred fifty-two".