21515050142153 has 8 divisors (see below), whose sum is σ = 21684782189568. Its totient is φ = 21345323129424.

The previous prime is 21515050142119. The next prime is 21515050142191. The reversal of 21515050142153 is 35124105051512.

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 21515050142153 - 2¹⁶ = 21515050076617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21515050144153) 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, 7564775 + ... + 10012787.

It is an arithmetic number, because the mean of its divisors is an integer number (2710597773696).

Almost surely, 2^{21515050142153} is an apocalyptic number.

It is an amenable number.

21515050142153 is a deficient number, since it is larger than the sum of its proper divisors (169732047415).

21515050142153 is a wasteful number, since it uses less digits than its factorization.

21515050142153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517343.

The product of its (nonzero) digits is 30000, while the sum is 35.

Adding to 21515050142153 its reverse (35124105051512), we get a palindrome (56639155193665).

The spelling of 21515050142153 in words is "twenty-one trillion, five hundred fifteen billion, fifty million, one hundred forty-two thousand, one hundred fifty-three".