21311247030 has 32 divisors (see below), whose sum is σ = 51175058688. Its totient is φ = 5679880800.

The previous prime is 21311247007. The next prime is 21311247037. The reversal of 21311247030 is 3074211312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311247037) 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, 139056 + ... + 248915.

It is an arithmetic number, because the mean of its divisors is an integer number (1599220584).

Almost surely, 2^21311247030 is an apocalyptic number.

21311247030 is an abundant number, since it is smaller than the sum of its proper divisors (29863811658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311247030 is a wasteful number, since it uses less digits than its factorization.

21311247030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389812.

The product of its (nonzero) digits is 1008, while the sum is 24.

Adding to 21311247030 its reverse (3074211312), we get a palindrome (24385458342).

The spelling of 21311247030 in words is "twenty-one billion, three hundred eleven million, two hundred forty-seven thousand, thirty".