21012011212210 has 8 divisors (see below), whose sum is σ = 37821620181996. Its totient is φ = 8404804484880.

The previous prime is 21012011212147. The next prime is 21012011212351. The reversal of 21012011212210 is 1221211021012.

It can be written as a sum of positive squares in 2 ways, for example, as 18641522961889 + 2370488250321 = 4317583^2 + 1539639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050600560601 + ... + 1050600560620.

Almost surely, 2^{21012011212210} is an apocalyptic number.

21012011212210 is a deficient number, since it is larger than the sum of its proper divisors (16809608969786).

21012011212210 is a wasteful number, since it uses less digits than its factorization.

21012011212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101201121228.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21012011212210 its reverse (1221211021012), we get a palindrome (22233222233222).

The spelling of 21012011212210 in words is "twenty-one trillion, twelve billion, eleven million, two hundred twelve thousand, two hundred ten".