21002652143 has 4 divisors (see below), whose sum is σ = 22911984168. Its totient is φ = 19093320120.

The previous prime is 21002652137. The next prime is 21002652149. The reversal of 21002652143 is 34125620012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21002652137) and next prime (21002652149).

It is a cyclic number.

It is not a de Polignac number, because 21002652143 - 2⁴ = 21002652127 is a prime.

It is a super-2 number, since 2×21002652143² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002652149) 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, 954665996 + ... + 954666017.

It is an arithmetic number, because the mean of its divisors is an integer number (5727996042).

Almost surely, 2^21002652143 is an apocalyptic number.

21002652143 is a deficient number, since it is larger than the sum of its proper divisors (1909332025).

21002652143 is a wasteful number, since it uses less digits than its factorization.

21002652143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909332024.

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 21002652143 in words is "twenty-one billion, two million, six hundred fifty-two thousand, one hundred forty-three".