21022001010 has 32 divisors (see below), whose sum is σ = 56058670080. Its totient is φ = 5605866864.

The previous prime is 21022000903. The next prime is 21022001029. The reversal of 21022001010 is 1010022012.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21022000983 and 21022001001.

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, 38929362 + ... + 38929901.

It is an arithmetic number, because the mean of its divisors is an integer number (1751833440).

Almost surely, 2^21022001010 is an apocalyptic number.

21022001010 is an abundant number, since it is smaller than the sum of its proper divisors (35036669070).

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

21022001010 is a wasteful number, since it uses less digits than its factorization.

21022001010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77859279 (or 77859273 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21022001010 its reverse (1010022012), we get a palindrome (22032023022).

The spelling of 21022001010 in words is "twenty-one billion, twenty-two million, one thousand, ten".