21512452131235 has 16 divisors (see below), whose sum is σ = 27809259075360. Its totient is φ = 15881231808000.

The previous prime is 21512452131223. The next prime is 21512452131259. The reversal of 21512452131235 is 53213125421512.

It is a happy number.

It is not a de Polignac number, because 21512452131235 - 2⁴¹ = 19313428875683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21512452131194 and 21512452131203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50690070 + ... + 51112699.

It is an arithmetic number, because the mean of its divisors is an integer number (1738078692210).

Almost surely, 2^{21512452131235} is an apocalyptic number.

21512452131235 is a deficient number, since it is larger than the sum of its proper divisors (6296806944125).

21512452131235 is a wasteful number, since it uses less digits than its factorization.

21512452131235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101806038.

The product of its digits is 72000, while the sum is 37.

Adding to 21512452131235 its reverse (53213125421512), we get a palindrome (74725577552747).

The spelling of 21512452131235 in words is "twenty-one trillion, five hundred twelve billion, four hundred fifty-two million, one hundred thirty-one thousand, two hundred thirty-five".