21010010401 has 16 divisors (see below), whose sum is σ = 21966714880. Its totient is φ = 20072111040.

The previous prime is 21010010387. The next prime is 21010010407. The reversal of 21010010401 is 10401001012.

It is a cyclic number.

It is not a de Polignac number, because 21010010401 - 2²¹ = 21007913249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010010407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 924760 + ... + 947206.

It is an arithmetic number, because the mean of its divisors is an integer number (1372919680).

Almost surely, 2^21010010401 is an apocalyptic number.

It is an amenable number.

21010010401 is a deficient number, since it is larger than the sum of its proper divisors (956704479).

21010010401 is a wasteful number, since it uses less digits than its factorization.

21010010401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22864.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010010401 its reverse (10401001012), we get a palindrome (31411011413).

The spelling of 21010010401 in words is "twenty-one billion, ten million, ten thousand, four hundred one".