21030203102 has 16 divisors (see below), whose sum is σ = 32003724240. Its totient is φ = 10362532032.

The previous prime is 21030203101. The next prime is 21030203123. The reversal of 21030203102 is 20130203012.

It is a happy number.

It is a super-2 number, since 2×21030203102² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030203101) 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, 120833 + ... + 238035.

It is an arithmetic number, because the mean of its divisors is an integer number (2000232765).

Almost surely, 2^21030203102 is an apocalyptic number.

21030203102 is a deficient number, since it is larger than the sum of its proper divisors (10973521138).

21030203102 is a wasteful number, since it uses less digits than its factorization.

21030203102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118507.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21030203102 its reverse (20130203012), we get a palindrome (41160406114).

The spelling of 21030203102 in words is "twenty-one billion, thirty million, two hundred three thousand, one hundred two".