21000152135 has 8 divisors (see below), whose sum is σ = 26526508080. Its totient is φ = 15915904704.

The previous prime is 21000152119. The next prime is 21000152137. The reversal of 21000152135 is 53125100012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21000152135 - 2⁴ = 21000152119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000152137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110527022 + ... + 110527211.

It is an arithmetic number, because the mean of its divisors is an integer number (3315813510).

Almost surely, 2^21000152135 is an apocalyptic number.

21000152135 is a deficient number, since it is larger than the sum of its proper divisors (5526355945).

21000152135 is a wasteful number, since it uses less digits than its factorization.

21000152135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221054257.

The product of its (nonzero) digits is 300, while the sum is 20.

Adding to 21000152135 its reverse (53125100012), we get a palindrome (74125252147).

The spelling of 21000152135 in words is "twenty-one billion, one hundred fifty-two thousand, one hundred thirty-five".