122021999 has 4 divisors (see below), whose sum is σ = 133114920. Its totient is φ = 110929080.

The previous prime is 122021993. The next prime is 122022001. The reversal of 122021999 is 999120221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 122021999 - 2¹⁶ = 121956463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122021993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5546444 + ... + 5546465.

It is an arithmetic number, because the mean of its divisors is an integer number (33278730).

Almost surely, 2^122021999 is an apocalyptic number.

122021999 is a deficient number, since it is larger than the sum of its proper divisors (11092921).

122021999 is a wasteful number, since it uses less digits than its factorization.

122021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11092920.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 122021999 is about 11046.3568202372. The cubic root of 122021999 is about 495.9973754956.

The spelling of 122021999 in words is "one hundred twenty-two million, twenty-one thousand, nine hundred ninety-nine".