21012120201010 has 32 divisors (see below), whose sum is σ = 38745055590192. Its totient is φ = 8199691806720.

The previous prime is 21012120201001. The next prime is 21012120201011. The reversal of 21012120201010 is 1010202121012.

It can be written as a sum of positive squares in 8 ways, for example, as 1273550619289 + 19738569581721 = 1128517^2 + 4442811^2 .

It is not an unprimeable number, because it can be changed into a prime (21012120201011) 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, 21746292 + ... + 22691968.

Almost surely, 2^{21012120201010} is an apocalyptic number.

21012120201010 is a deficient number, since it is larger than the sum of its proper divisors (17732935389182).

21012120201010 is a wasteful number, since it uses less digits than its factorization.

21012120201010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999918.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21012120201010 its reverse (1010202121012), we get a palindrome (22022322322022).

The spelling of 21012120201010 in words is "twenty-one trillion, twelve billion, one hundred twenty million, two hundred one thousand, ten".