21421044510124 has 144 divisors (see below), whose sum is σ = 46559779402752. Its totient is φ = 8567971872768.

The previous prime is 21421044510119. The next prime is 21421044510133. The reversal of 21421044510124 is 42101544012412.

It is a super-2 number, since 2×21421044510124² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 894133554 + ... + 894157510.

It is an arithmetic number, because the mean of its divisors is an integer number (323331801408).

Almost surely, 2^{21421044510124} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21421044510124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23279889701376).

21421044510124 is an abundant number, since it is smaller than the sum of its proper divisors (25138734892628).

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

21421044510124 is a wasteful number, since it uses less digits than its factorization.

21421044510124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26232 (or 26223 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

Adding to 21421044510124 its reverse (42101544012412), we get a palindrome (63522588522536).

The spelling of 21421044510124 in words is "twenty-one trillion, four hundred twenty-one billion, forty-four million, five hundred ten thousand, one hundred twenty-four".