21534350120452 has 48 divisors (see below), whose sum is σ = 40623272529840. Its totient is φ = 9929309626368.

The previous prime is 21534350120447. The next prime is 21534350120471. The reversal of 21534350120452 is 25402105343512.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1264491254016 + 20269858866436 = 1124496^2 + 4502206^2 .

It is a super-2 number, since 2×21534350120452² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240205428 + ... + 240295060.

It is an arithmetic number, because the mean of its divisors is an integer number (846318177705).

Almost surely, 2^{21534350120452} is an apocalyptic number.

It is an amenable number.

21534350120452 is a deficient number, since it is larger than the sum of its proper divisors (19088922409388).

21534350120452 is a wasteful number, since it uses less digits than its factorization.

21534350120452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94072 (or 94070 counting only the distinct ones).

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

Adding to 21534350120452 its reverse (25402105343512), we get a palindrome (46936455463964).

The spelling of 21534350120452 in words is "twenty-one trillion, five hundred thirty-four billion, three hundred fifty million, one hundred twenty thousand, four hundred fifty-two".