21496741820 has 24 divisors (see below), whose sum is σ = 45163742064. Its totient is φ = 8594775936.

The previous prime is 21496741817. The next prime is 21496741829. The reversal of 21496741820 is 2814769412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21496741829) 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, 199889 + ... + 288008.

It is an arithmetic number, because the mean of its divisors is an integer number (1881822586).

Almost surely, 2^21496741820 is an apocalyptic number.

21496741820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21496741820 is an abundant number, since it is smaller than the sum of its proper divisors (23667000244).

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

21496741820 is a wasteful number, since it uses less digits than its factorization.

21496741820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490109 (or 490107 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 21496741820 in words is "twenty-one billion, four hundred ninety-six million, seven hundred forty-one thousand, eight hundred twenty".