21145650155 has 8 divisors (see below), whose sum is σ = 28999748832. Its totient is φ = 14499874368.

The previous prime is 21145650137. The next prime is 21145650161. The reversal of 21145650155 is 55105654112.

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

It is not a de Polignac number, because 21145650155 - 2¹² = 21145646059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 604161433 = 21145650155 / (2 + 1 + 1 + 4 + 5 + 6 + 5 + 0 + 1 + 5 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302080682 + ... + 302080751.

It is an arithmetic number, because the mean of its divisors is an integer number (3624968604).

Almost surely, 2^21145650155 is an apocalyptic number.

21145650155 is a deficient number, since it is larger than the sum of its proper divisors (7854098677).

21145650155 is an equidigital number, since it uses as much as digits as its factorization.

21145650155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604161445.

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

The spelling of 21145650155 in words is "twenty-one billion, one hundred forty-five million, six hundred fifty thousand, one hundred fifty-five".