21204232151 has 8 divisors (see below), whose sum is σ = 22889126880. Its totient is φ = 19582918432.

The previous prime is 21204232099. The next prime is 21204232157. The reversal of 21204232151 is 15123240212.

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 21204232151 - 2³⁴ = 4024362967 is a prime.

It is a super-2 number, since 2×21204232151² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204232157) 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, 15894560 + ... + 15895893.

It is an arithmetic number, because the mean of its divisors is an integer number (2861140860).

Almost surely, 2^21204232151 is an apocalyptic number.

21204232151 is a deficient number, since it is larger than the sum of its proper divisors (1684894729).

21204232151 is a wasteful number, since it uses less digits than its factorization.

21204232151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31790505.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21204232151 its reverse (15123240212), we get a palindrome (36327472363).

The spelling of 21204232151 in words is "twenty-one billion, two hundred four million, two hundred thirty-two thousand, one hundred fifty-one".