21154605043 has 8 divisors (see below), whose sum is σ = 24852962736. Its totient is φ = 17752116000.

The previous prime is 21154605041. The next prime is 21154605053. The reversal of 21154605043 is 34050645112.

It is a happy number.

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 21154605043 - 2¹ = 21154605041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21154604996 and 21154605014.

It is not an unprimeable number, because it can be changed into a prime (21154605041) 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, 73967008 + ... + 73967293.

It is an arithmetic number, because the mean of its divisors is an integer number (3106620342).

Almost surely, 2^21154605043 is an apocalyptic number.

21154605043 is a deficient number, since it is larger than the sum of its proper divisors (3698357693).

21154605043 is a wasteful number, since it uses less digits than its factorization.

21154605043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147934325.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 21154605043 in words is "twenty-one billion, one hundred fifty-four million, six hundred five thousand, forty-three".