21620061012066 has 32 divisors (see below), whose sum is σ = 47944337990976. Its totient is φ = 6444131448000.

The previous prime is 21620061012041. The next prime is 21620061012091. The reversal of 21620061012066 is 66021016002612.

It is an interprime number because it is at equal distance from previous prime (21620061012041) and next prime (21620061012091).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2685050745 + ... + 2685058796.

It is an arithmetic number, because the mean of its divisors is an integer number (1498260562218).

Almost surely, 2^{21620061012066} is an apocalyptic number.

21620061012066 is an abundant number, since it is smaller than the sum of its proper divisors (26324276978910).

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

21620061012066 is a wasteful number, since it uses less digits than its factorization.

21620061012066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5370109618.

The product of its (nonzero) digits is 10368, while the sum is 33.

Adding to 21620061012066 its reverse (66021016002612), we get a palindrome (87641077014678).

The spelling of 21620061012066 in words is "twenty-one trillion, six hundred twenty billion, sixty-one million, twelve thousand, sixty-six".