21411102021 has 16 divisors (see below), whose sum is σ = 29872917504. Its totient is φ = 13626235584.

The previous prime is 21411102019. The next prime is 21411102043. The reversal of 21411102021 is 12020111412.

It is not a de Polignac number, because 21411102021 - 2¹ = 21411102019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411102001) 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, 1813861 + ... + 1825626.

It is an arithmetic number, because the mean of its divisors is an integer number (1867057344).

Almost surely, 2^21411102021 is an apocalyptic number.

It is an amenable number.

21411102021 is a deficient number, since it is larger than the sum of its proper divisors (8461815483).

21411102021 is a wasteful number, since it uses less digits than its factorization.

21411102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3639580.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21411102021 its reverse (12020111412), we get a palindrome (33431213433).

The spelling of 21411102021 in words is "twenty-one billion, four hundred eleven million, one hundred two thousand, twenty-one".