21154012153 has 8 divisors (see below), whose sum is σ = 21648849728. Its totient is φ = 20659305744.

The previous prime is 21154012151. The next prime is 21154012223. The reversal of 21154012153 is 35121045112.

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 21154012153 - 2¹ = 21154012151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21154012151) 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, 343375 + ... + 400267.

It is an arithmetic number, because the mean of its divisors is an integer number (2706106216).

Almost surely, 2^21154012153 is an apocalyptic number.

It is an amenable number.

21154012153 is a deficient number, since it is larger than the sum of its proper divisors (494837575).

21154012153 is an equidigital number, since it uses as much as digits as its factorization.

21154012153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65583.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 21154012153 its reverse (35121045112), we get a palindrome (56275057265).

The spelling of 21154012153 in words is "twenty-one billion, one hundred fifty-four million, twelve thousand, one hundred fifty-three".