21220121102010 has 32 divisors (see below), whose sum is σ = 50928411908160. Its totient is φ = 5658685486848.

The previous prime is 21220121101979. The next prime is 21220121102041. The reversal of 21220121102010 is 1020112102212.

It is an interprime number because it is at equal distance from previous prime (21220121101979) and next prime (21220121102041).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23546274 + ... + 24430866.

It is an arithmetic number, because the mean of its divisors is an integer number (1591512872130).

Almost surely, 2^{21220121102010} is an apocalyptic number.

21220121102010 is an abundant number, since it is smaller than the sum of its proper divisors (29708290806150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21220121102010 is a wasteful number, since it uses less digits than its factorization.

21220121102010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684222.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21220121102010 its reverse (1020112102212), we get a palindrome (22240233204222).

The spelling of 21220121102010 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred two thousand, ten".