21106506201610 has 32 divisors (see below), whose sum is σ = 40255067851920. Its totient is φ = 7940339269632.

The previous prime is 21106506201601. The next prime is 21106506201611. The reversal of 21106506201610 is 1610260560112.

It can be written as a sum of positive squares in 8 ways, for example, as 858315161209 + 20248191040401 = 926453^2 + 4499799^2 .

It is not an unprimeable number, because it can be changed into a prime (21106506201611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43818639 + ... + 44297698.

Almost surely, 2^{21106506201610} is an apocalyptic number.

21106506201610 is a deficient number, since it is larger than the sum of its proper divisors (19148561650310).

21106506201610 is a wasteful number, since it uses less digits than its factorization.

21106506201610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88117770.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 21106506201610 its reverse (1610260560112), we get a palindrome (22716766761722).

The spelling of 21106506201610 in words is "twenty-one trillion, one hundred six billion, five hundred six million, two hundred one thousand, six hundred ten".