21661030401322 has 32 divisors (see below), whose sum is σ = 35817157031040. Its totient is φ = 9761486454720.

The previous prime is 21661030401221. The next prime is 21661030401337. The reversal of 21661030401322 is 22310403016612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187422 + ... + 6584617.

It is an arithmetic number, because the mean of its divisors is an integer number (1119286157220).

Almost surely, 2^{21661030401322} is an apocalyptic number.

21661030401322 is a deficient number, since it is larger than the sum of its proper divisors (14156126629718).

21661030401322 is a wasteful number, since it uses less digits than its factorization.

21661030401322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6774958.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21661030401322 its reverse (22310403016612), we get a palindrome (43971433417934).

The spelling of 21661030401322 in words is "twenty-one trillion, six hundred sixty-one billion, thirty million, four hundred one thousand, three hundred twenty-two".