21620202041 has 16 divisors (see below), whose sum is σ = 22381567488. Its totient is φ = 20870467200.

The previous prime is 21620202029. The next prime is 21620202083. The reversal of 21620202041 is 14020202612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21620202041 - 2²² = 21616007737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21620202841) 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, 4345031 + ... + 4350003.

It is an arithmetic number, because the mean of its divisors is an integer number (1398847968).

Almost surely, 2^21620202041 is an apocalyptic number.

It is an amenable number.

21620202041 is a deficient number, since it is larger than the sum of its proper divisors (761365447).

21620202041 is a wasteful number, since it uses less digits than its factorization.

21620202041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6112.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21620202041 its reverse (14020202612), we get a palindrome (35640404653).

The spelling of 21620202041 in words is "twenty-one billion, six hundred twenty million, two hundred two thousand, forty-one".