21242144586 has 32 divisors (see below), whose sum is σ = 46379067840. Its totient is φ = 6446507904.

The previous prime is 21242144579. The next prime is 21242144603. The reversal of 21242144586 is 68544124212.

It is a super-2 number, since 2×21242144586² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1859616 + ... + 1871003.

It is an arithmetic number, because the mean of its divisors is an integer number (1449345870).

Almost surely, 2^21242144586 is an apocalyptic number.

21242144586 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21242144586 is an abundant number, since it is smaller than the sum of its proper divisors (25136923254).

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

21242144586 is a wasteful number, since it uses less digits than its factorization.

21242144586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3730710.

The product of its digits is 122880, while the sum is 39.

Adding to 21242144586 its reverse (68544124212), we get a palindrome (89786268798).

The spelling of 21242144586 in words is "twenty-one billion, two hundred forty-two million, one hundred forty-four thousand, five hundred eighty-six".