21512540330134 has 8 divisors (see below), whose sum is σ = 36878640565968. Its totient is φ = 9219660141480.

The previous prime is 21512540329981. The next prime is 21512540330137. The reversal of 21512540330134 is 43103304521512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21512540330134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21512540330137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768305011777 + ... + 768305011804.

It is an arithmetic number, because the mean of its divisors is an integer number (4609830070746).

Almost surely, 2^{21512540330134} is an apocalyptic number.

21512540330134 is a deficient number, since it is larger than the sum of its proper divisors (15366100235834).

21512540330134 is a wasteful number, since it uses less digits than its factorization.

21512540330134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536610023590.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 21512540330134 its reverse (43103304521512), we get a palindrome (64615844851646).

The spelling of 21512540330134 in words is "twenty-one trillion, five hundred twelve billion, five hundred forty million, three hundred thirty thousand, one hundred thirty-four".