21016420041 has 8 divisors (see below), whose sum is σ = 28035835744. Its totient is φ = 14003975520.

The previous prime is 21016420027. The next prime is 21016420063. The reversal of 21016420041 is 14002461012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21016420041 - 2¹³ = 21016411849 is a prime.

It is a super-2 number, since 2×21016420041² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21016420021) 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, 1735756 + ... + 1747821.

It is an arithmetic number, because the mean of its divisors is an integer number (3504479468).

Almost surely, 2^21016420041 is an apocalyptic number.

It is an amenable number.

21016420041 is a deficient number, since it is larger than the sum of its proper divisors (7019415703).

21016420041 is a wasteful number, since it uses less digits than its factorization.

21016420041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485591.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21016420041 its reverse (14002461012), we get a palindrome (35018881053).

The spelling of 21016420041 in words is "twenty-one billion, sixteen million, four hundred twenty thousand, forty-one".