1721900022 has 16 divisors (see below), whose sum is σ = 3554890752. Its totient is φ = 555451560.

The previous prime is 1721900021. The next prime is 1721900051. The reversal of 1721900022 is 2200091271.

It is a junction number, because it is equal to n+sod(n) for n = 1721899965 and 1721900001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721900021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4628578 + ... + 4628949.

It is an arithmetic number, because the mean of its divisors is an integer number (222180672).

Almost surely, 2^1721900022 is an apocalyptic number.

1721900022 is an abundant number, since it is smaller than the sum of its proper divisors (1832990730).

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

1721900022 is a wasteful number, since it uses less digits than its factorization.

1721900022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9257563.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 1721900022 is about 41495.7831833549. The cubic root of 1721900022 is about 1198.5863032608.

Adding to 1721900022 its reverse (2200091271), we get a palindrome (3921991293).

The spelling of 1721900022 in words is "one billion, seven hundred twenty-one million, nine hundred thousand, twenty-two".