21311202 has 64 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 6072000.

The previous prime is 21311177. The next prime is 21311219. The reversal of 21311202 is 20211312.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153249 + ... + 153387.

It is an arithmetic number, because the mean of its divisors is an integer number (771120).

Almost surely, 2^21311202 is an apocalyptic number.

21311202 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21311202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24675840).

21311202 is an abundant number, since it is smaller than the sum of its proper divisors (28040478).

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

21311202 is a wasteful number, since it uses less digits than its factorization.

21311202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 21311202 is about 4616.4057447326. The cubic root of 21311202 is about 277.2485702473.

Adding to 21311202 its reverse (20211312), we get a palindrome (41522514).

It can be divided in two parts, 2131 and 1202, that added together give a palindrome (3333).

The spelling of 21311202 in words is "twenty-one million, three hundred eleven thousand, two hundred two".