21036204155 has 8 divisors (see below), whose sum is σ = 25245080784. Its totient is φ = 16827872800.

The previous prime is 21036204151. The next prime is 21036204157. The reversal of 21036204155 is 55140263012.

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

It is not a de Polignac number, because 21036204155 - 2² = 21036204151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21036204151) 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, 46001 + ... + 210210.

It is an arithmetic number, because the mean of its divisors is an integer number (3155635098).

Almost surely, 2^21036204155 is an apocalyptic number.

21036204155 is a deficient number, since it is larger than the sum of its proper divisors (4208876629).

21036204155 is a wasteful number, since it uses less digits than its factorization.

21036204155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272637.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21036204155 its reverse (55140263012), we get a palindrome (76176467167).

The spelling of 21036204155 in words is "twenty-one billion, thirty-six million, two hundred four thousand, one hundred fifty-five".