21202021010 has 16 divisors (see below), whose sum is σ = 38975630976. Its totient is φ = 8300365488.

The previous prime is 21202020971. The next prime is 21202021039. The reversal of 21202021010 is 1012020212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21202020982 and 21202021000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22554872 + ... + 22555811.

It is an arithmetic number, because the mean of its divisors is an integer number (2435976936).

Almost surely, 2^21202021010 is an apocalyptic number.

21202021010 is a deficient number, since it is larger than the sum of its proper divisors (17773609966).

21202021010 is a wasteful number, since it uses less digits than its factorization.

21202021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45110737.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21202021010 its reverse (1012020212), we get a palindrome (22214041222).

It can be divided in two parts, 2120202 and 1010, that added together give a palindrome (2121212).

The spelling of 21202021010 in words is "twenty-one billion, two hundred two million, twenty-one thousand, ten".