21020024140043 has 4 divisors (see below), whose sum is σ = 21173454973320. Its totient is φ = 20866593306768.

The previous prime is 21020024139949. The next prime is 21020024140103. The reversal of 21020024140043 is 34004142002012.

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

It is a cyclic number.

It is not a de Polignac number, because 21020024140043 - 2¹⁰ = 21020024139019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020024142043) 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, 76715416433 + ... + 76715416706.

It is an arithmetic number, because the mean of its divisors is an integer number (5293363743330).

Almost surely, 2^{21020024140043} is an apocalyptic number.

21020024140043 is a deficient number, since it is larger than the sum of its proper divisors (153430833277).

21020024140043 is a wasteful number, since it uses less digits than its factorization.

21020024140043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153430833276.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21020024140043 its reverse (34004142002012), we get a palindrome (55024166142055).

The spelling of 21020024140043 in words is "twenty-one trillion, twenty billion, twenty-four million, one hundred forty thousand, forty-three".