21355896155 has 8 divisors (see below), whose sum is σ = 27956809584. Its totient is φ = 15531560800.

The previous prime is 21355896131. The next prime is 21355896181. The reversal of 21355896155 is 55169855312.

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

It is not a de Polignac number, because 21355896155 - 2¹⁸ = 21355634011 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194144456 + ... + 194144565.

It is an arithmetic number, because the mean of its divisors is an integer number (3494601198).

Almost surely, 2^21355896155 is an apocalyptic number.

21355896155 is a deficient number, since it is larger than the sum of its proper divisors (6600913429).

21355896155 is a wasteful number, since it uses less digits than its factorization.

21355896155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388289037.

The product of its digits is 1620000, while the sum is 50.

The spelling of 21355896155 in words is "twenty-one billion, three hundred fifty-five million, eight hundred ninety-six thousand, one hundred fifty-five".