21421210142044 has 12 divisors (see below), whose sum is σ = 37488051079024. Its totient is φ = 10710338405184.

The previous prime is 21421210141993. The next prime is 21421210142069. The reversal of 21421210142044 is 44024101212412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66485664 + ... + 66807079.

Almost surely, 2^{21421210142044} is an apocalyptic number.

It is an amenable number.

21421210142044 is a deficient number, since it is larger than the sum of its proper divisors (16066840936980).

21421210142044 is a wasteful number, since it uses less digits than its factorization.

21421210142044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133332924 (or 133332922 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

Adding to 21421210142044 its reverse (44024101212412), we get a palindrome (65445311354456).

The spelling of 21421210142044 in words is "twenty-one trillion, four hundred twenty-one billion, two hundred ten million, one hundred forty-two thousand, forty-four".