21420102083 has 2 divisors, whose sum is σ = 21420102084. Its totient is φ = 21420102082.

The previous prime is 21420102079. The next prime is 21420102097. The reversal of 21420102083 is 38020102412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21420102083 - 2² = 21420102079 is a prime.

It is a super-2 number, since 2×21420102083² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21420102283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710051041 + 10710051042.

It is an arithmetic number, because the mean of its divisors is an integer number (10710051042).

Almost surely, 2^21420102083 is an apocalyptic number.

21420102083 is a deficient number, since it is larger than the sum of its proper divisors (1).

21420102083 is an equidigital number, since it uses as much as digits as its factorization.

21420102083 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21420102083 its reverse (38020102412), we get a palindrome (59440204495).

The spelling of 21420102083 in words is "twenty-one billion, four hundred twenty million, one hundred two thousand, eighty-three".