21421110021244 has 6 divisors (see below), whose sum is σ = 37486942537184. Its totient is φ = 10710555010620.

The previous prime is 21421110021197. The next prime is 21421110021257. The reversal of 21421110021244 is 44212001112412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2677638752652 + ... + 2677638752659.

Almost surely, 2^{21421110021244} is an apocalyptic number.

It is an amenable number.

21421110021244 is a deficient number, since it is larger than the sum of its proper divisors (16065832515940).

21421110021244 is a wasteful number, since it uses less digits than its factorization.

21421110021244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355277505315 (or 5355277505313 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

Adding to 21421110021244 its reverse (44212001112412), we get a palindrome (65633111133656).

The spelling of 21421110021244 in words is "twenty-one trillion, four hundred twenty-one billion, one hundred ten million, twenty-one thousand, two hundred forty-four".