21421141749 has 48 divisors (see below), whose sum is σ = 36352772352. Its totient is φ = 11898296064.

The previous prime is 21421141739. The next prime is 21421141751. The reversal of 21421141749 is 94714112412.

It is a happy number.

21421141749 is a `hidden beast` number, since 21 + 4 + 211 + 417 + 4 + 9 = 666.

It is not a de Polignac number, because 21421141749 - 2⁵ = 21421141717 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421141739) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2777032 + ... + 2784734.

It is an arithmetic number, because the mean of its divisors is an integer number (757349424).

Almost surely, 2^21421141749 is an apocalyptic number.

It is an amenable number.

21421141749 is a deficient number, since it is larger than the sum of its proper divisors (14931630603).

21421141749 is a wasteful number, since it uses less digits than its factorization.

21421141749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8946 (or 8943 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The spelling of 21421141749 in words is "twenty-one billion, four hundred twenty-one million, one hundred forty-one thousand, seven hundred forty-nine".