21150451545 has 16 divisors (see below), whose sum is σ = 33855433920. Its totient is φ = 11275337024.

The previous prime is 21150451523. The next prime is 21150451579. The reversal of 21150451545 is 54515405112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21150451545 - 2¹⁴ = 21150435161 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270699 + ... + 339968.

It is an arithmetic number, because the mean of its divisors is an integer number (2115964620).

Almost surely, 2^21150451545 is an apocalyptic number.

It is an amenable number.

21150451545 is a deficient number, since it is larger than the sum of its proper divisors (12704982375).

21150451545 is a wasteful number, since it uses less digits than its factorization.

21150451545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612984.

The product of its (nonzero) digits is 20000, while the sum is 33.

Adding to 21150451545 its reverse (54515405112), we get a palindrome (75665856657).

The spelling of 21150451545 in words is "twenty-one billion, one hundred fifty million, four hundred fifty-one thousand, five hundred forty-five".