21323521151 has 8 divisors (see below), whose sum is σ = 22206171264. Its totient is φ = 20453045760.

The previous prime is 21323521123. The next prime is 21323521199. The reversal of 21323521151 is 15112532312.

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 21323521151 - 2¹⁸ = 21323259007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21323521151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323511151) 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, 3040106 + ... + 3047111.

It is an arithmetic number, because the mean of its divisors is an integer number (2775771408).

Almost surely, 2^21323521151 is an apocalyptic number.

21323521151 is a deficient number, since it is larger than the sum of its proper divisors (882650113).

21323521151 is a wasteful number, since it uses less digits than its factorization.

21323521151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087361.

The product of its digits is 1800, while the sum is 26.

The spelling of 21323521151 in words is "twenty-one billion, three hundred twenty-three million, five hundred twenty-one thousand, one hundred fifty-one".