21145543001 has 8 divisors (see below), whose sum is σ = 23089826208. Its totient is φ = 19204920000.

The previous prime is 21145542961. The next prime is 21145543087. The reversal of 21145543001 is 10034554112.

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 21145543001 - 2²⁶ = 21078434137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21145543091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 902960 + ... + 926081.

It is an arithmetic number, because the mean of its divisors is an integer number (2886228276).

Almost surely, 2^21145543001 is an apocalyptic number.

It is an amenable number.

21145543001 is a deficient number, since it is larger than the sum of its proper divisors (1944283207).

21145543001 is a wasteful number, since it uses less digits than its factorization.

21145543001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830103.

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 21145543001 in words is "twenty-one billion, one hundred forty-five million, five hundred forty-three thousand, one".