21201220010 has 8 divisors (see below), whose sum is σ = 38162196036. Its totient is φ = 8480488000.

The previous prime is 21201219997. The next prime is 21201220031. The reversal of 21201220010 is 1002210212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21079845721 + 121374289 = 145189^2 + 11017^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21201219973 and 21201220000.

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, 1060060991 + ... + 1060061010.

Almost surely, 2^21201220010 is an apocalyptic number.

21201220010 is a deficient number, since it is larger than the sum of its proper divisors (16960976026).

21201220010 is a wasteful number, since it uses less digits than its factorization.

21201220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120122008.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21201220010 its reverse (1002210212), we get a palindrome (22203430222).

The spelling of 21201220010 in words is "twenty-one billion, two hundred one million, two hundred twenty thousand, ten".