21145032554 has 8 divisors (see below), whose sum is σ = 31731509700. Its totient is φ = 10567862656.

The previous prime is 21145032553. The next prime is 21145032583. The reversal of 21145032554 is 45523054112.

It can be written as a sum of positive squares in 2 ways, for example, as 20931434329 + 213598225 = 144677^2 + 14615^2 .

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

It is a super-2 number, since 2×21145032554² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21145032554.

It is not an unprimeable number, because it can be changed into a prime (21145032551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321129 + ... + 2330220.

Almost surely, 2^21145032554 is an apocalyptic number.

21145032554 is a deficient number, since it is larger than the sum of its proper divisors (10586477146).

21145032554 is a wasteful number, since it uses less digits than its factorization.

21145032554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4653624.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 21145032554 its reverse (45523054112), we get a palindrome (66668086666).

The spelling of 21145032554 in words is "twenty-one billion, one hundred forty-five million, thirty-two thousand, five hundred fifty-four".