20858543121 has 32 divisors (see below), whose sum is σ = 31659264000. Its totient is φ = 12109462848.

The previous prime is 20858543077. The next prime is 20858543143. The reversal of 20858543121 is 12134585802.

It is not a de Polignac number, because 20858543121 - 2¹⁹ = 20858018833 is a prime.

It is a super-2 number, since 2×20858543121² (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 self number, because there is not a number n which added to its sum of digits gives 20858543121.

It is not an unprimeable number, because it can be changed into a prime (20858543521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118210 + ... + 235988.

It is an arithmetic number, because the mean of its divisors is an integer number (989352000).

Almost surely, 2^20858543121 is an apocalyptic number.

It is an amenable number.

20858543121 is a deficient number, since it is larger than the sum of its proper divisors (10800720879).

20858543121 is a wasteful number, since it uses less digits than its factorization.

20858543121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118053.

The product of its (nonzero) digits is 76800, while the sum is 39.

The spelling of 20858543121 in words is "twenty billion, eight hundred fifty-eight million, five hundred forty-three thousand, one hundred twenty-one".