21244210102 has 16 divisors (see below), whose sum is σ = 32073332400. Its totient is φ = 10553207040.

The previous prime is 21244210093. The next prime is 21244210103. The reversal of 21244210102 is 20101244212.

It is a self number, because there is not a number n which added to its sum of digits gives 21244210102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244210103) 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, 377902 + ... + 430462.

It is an arithmetic number, because the mean of its divisors is an integer number (2004583275).

Almost surely, 2^21244210102 is an apocalyptic number.

21244210102 is a deficient number, since it is larger than the sum of its proper divisors (10829122298).

21244210102 is a wasteful number, since it uses less digits than its factorization.

21244210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53871.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21244210102 its reverse (20101244212), we get a palindrome (41345454314).

The spelling of 21244210102 in words is "twenty-one billion, two hundred forty-four million, two hundred ten thousand, one hundred two".