122521861 has 32 divisors (see below), whose sum is σ = 162892800. Its totient is φ = 89268480.

The previous prime is 122521859. The next prime is 122521877. The reversal of 122521861 is 168125221.

It is not a de Polignac number, because 122521861 - 2¹ = 122521859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122521891) 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, 120925 + ... + 121933.

It is an arithmetic number, because the mean of its divisors is an integer number (5090400).

Almost surely, 2^122521861 is an apocalyptic number.

122521861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

122521861 is the 6391-st octagonal number.

It is an amenable number.

122521861 is a deficient number, since it is larger than the sum of its proper divisors (40370939).

122521861 is a wasteful number, since it uses less digits than its factorization.

122521861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129.

The product of its digits is 1920, while the sum is 28.

The square root of 122521861 is about 11068.9593458464. The cubic root of 122521861 is about 496.6737356670.

The spelling of 122521861 in words is "one hundred twenty-two million, five hundred twenty-one thousand, eight hundred sixty-one".