21502703043 has 16 divisors (see below), whose sum is σ = 31861939200. Its totient is φ = 14332398120.

The previous prime is 21502703039. The next prime is 21502703071. The reversal of 21502703043 is 34030720512.

21502703043 is a `hidden beast` number, since 21 + 502 + 70 + 30 + 43 = 666.

It is a Cunningham number, because it is equal to 146638²-1.

It is not a de Polignac number, because 21502703043 - 2² = 21502703039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21502702998 and 21502703016.

It is not an unprimeable number, because it can be changed into a prime (21502703543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73318 + ... + 219956.

It is an arithmetic number, because the mean of its divisors is an integer number (1991371200).

Almost surely, 2^21502703043 is an apocalyptic number.

21502703043 is a deficient number, since it is larger than the sum of its proper divisors (10359236157).

21502703043 is a wasteful number, since it uses less digits than its factorization.

21502703043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152079 (or 152073 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The spelling of 21502703043 in words is "twenty-one billion, five hundred two million, seven hundred three thousand, forty-three".