21661020601342 has 16 divisors (see below), whose sum is σ = 32950765980000. Its totient is φ = 10677446829280.

The previous prime is 21661020601331. The next prime is 21661020601369. The reversal of 21661020601342 is 24310602016612.

It is a junction number, because it is equal to n+sod(n) for n = 21661020601298 and 21661020601307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 793717 + ... + 6629632.

It is an arithmetic number, because the mean of its divisors is an integer number (2059422873750).

Almost surely, 2^{21661020601342} is an apocalyptic number.

21661020601342 is a deficient number, since it is larger than the sum of its proper divisors (11289745378658).

21661020601342 is a wasteful number, since it uses less digits than its factorization.

21661020601342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7443971.

The product of its (nonzero) digits is 20736, while the sum is 34.

Adding to 21661020601342 its reverse (24310602016612), we get a palindrome (45971622617954).

The spelling of 21661020601342 in words is "twenty-one trillion, six hundred sixty-one billion, twenty million, six hundred one thousand, three hundred forty-two".