21201588043 has 2 divisors, whose sum is σ = 21201588044. Its totient is φ = 21201588042.

The previous prime is 21201588019. The next prime is 21201588061. The reversal of 21201588043 is 34088510212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21201588043 - 2²¹ = 21199490891 is a prime.

It is not a weakly prime, because it can be changed into another prime (21201583043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600794021 + 10600794022.

It is an arithmetic number, because the mean of its divisors is an integer number (10600794022).

Almost surely, 2^21201588043 is an apocalyptic number.

21201588043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201588043 is an equidigital number, since it uses as much as digits as its factorization.

21201588043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15360, while the sum is 34.

The spelling of 21201588043 in words is "twenty-one billion, two hundred one million, five hundred eighty-eight thousand, forty-three".