2010721221621 has 96 divisors (see below), whose sum is σ = 3533083287552. Its totient is φ = 1077791495040.

The previous prime is 2010721221611. The next prime is 2010721221643. The reversal of 2010721221621 is 1261221270102.

It is a happy number.

2010721221621 is a `hidden beast` number, since 2 + 0 + 1 + 0 + 7 + 2 + 12 + 21 + 621 = 666.

It is not a de Polignac number, because 2010721221621 - 2¹⁷ = 2010721090549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2010721221611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8474226 + ... + 8708268.

It is an arithmetic number, because the mean of its divisors is an integer number (36802950912).

Almost surely, 2^{2010721221621} is an apocalyptic number.

2010721221621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2010721221621 is a deficient number, since it is larger than the sum of its proper divisors (1522362065931).

2010721221621 is a wasteful number, since it uses less digits than its factorization.

2010721221621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234223 (or 234220 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

Adding to 2010721221621 its reverse (1261221270102), we get a palindrome (3271942491723).

The spelling of 2010721221621 in words is "two trillion, ten billion, seven hundred twenty-one million, two hundred twenty-one thousand, six hundred twenty-one".