21858538060 has 24 divisors (see below), whose sum is σ = 47898710496. Its totient is φ = 8363266560.

The previous prime is 21858538033. The next prime is 21858538081. The reversal of 21858538060 is 6083585812.

It is a super-2 number, since 2×21858538060² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 21858538060.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23758821 + ... + 23759740.

It is an arithmetic number, because the mean of its divisors is an integer number (1995779604).

Almost surely, 2^21858538060 is an apocalyptic number.

21858538060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21858538060 is an abundant number, since it is smaller than the sum of its proper divisors (26040172436).

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

21858538060 is a wasteful number, since it uses less digits than its factorization.

21858538060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47518593 (or 47518591 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 21858538060 in words is "twenty-one billion, eight hundred fifty-eight million, five hundred thirty-eight thousand, sixty".