21210120021010 has 8 divisors (see below), whose sum is σ = 38178216037836. Its totient is φ = 8484048008400.

The previous prime is 21210120020983. The next prime is 21210120021037. The reversal of 21210120021010 is 1012002101212.

It is an interprime number because it is at equal distance from previous prime (21210120020983) and next prime (21210120021037).

It can be written as a sum of positive squares in 2 ways, for example, as 20417501956329 + 792618064681 = 4518573^2 + 890291^2 .

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, 1060506001041 + ... + 1060506001060.

Almost surely, 2^{21210120021010} is an apocalyptic number.

21210120021010 is a deficient number, since it is larger than the sum of its proper divisors (16968096016826).

21210120021010 is a wasteful number, since it uses less digits than its factorization.

21210120021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121012002108.

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

Adding to 21210120021010 its reverse (1012002101212), we get a palindrome (22222122122222).

The spelling of 21210120021010 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, twenty-one thousand, ten".