21010001010 has 32 divisors (see below), whose sum is σ = 50514570432. Its totient is φ = 5592603840.

The previous prime is 21010000967. The next prime is 21010001011. The reversal of 21010001010 is 1010001012.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a self number, because there is not a number n which added to its sum of digits gives 21010001010.

It is not an unprimeable number, because it can be changed into a prime (21010001011) 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, 611956 + ... + 645375.

It is an arithmetic number, because the mean of its divisors is an integer number (1578580326).

Almost surely, 2^21010001010 is an apocalyptic number.

21010001010 is an abundant number, since it is smaller than the sum of its proper divisors (29504569422).

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

21010001010 is a wasteful number, since it uses less digits than its factorization.

21010001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257898.

The product of its (nonzero) digits is 2, while the sum is 6.

Adding to 21010001010 its reverse (1010001012), we get a palindrome (22020002022).

The spelling of 21010001010 in words is "twenty-one billion, ten million, one thousand, ten".