21211312030 has 16 divisors (see below), whose sum is σ = 38182741920. Its totient is φ = 8483995872.

The previous prime is 21211312021. The next prime is 21211312081. The reversal of 21211312030 is 3021311212.

It is a junction number, because it is equal to n+sod(n) for n = 21211311995 and 21211312013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130012 + ... + 243568.

It is an arithmetic number, because the mean of its divisors is an integer number (2386421370).

Almost surely, 2^21211312030 is an apocalyptic number.

21211312030 is a deficient number, since it is larger than the sum of its proper divisors (16971429890).

21211312030 is a wasteful number, since it uses less digits than its factorization.

21211312030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132243.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21211312030 its reverse (3021311212), we get a palindrome (24232623242).

The spelling of 21211312030 in words is "twenty-one billion, two hundred eleven million, three hundred twelve thousand, thirty".