21221020212010 has 16 divisors (see below), whose sum is σ = 38576032783272. Its totient is φ = 8404364440000.

The previous prime is 21221020212001. The next prime is 21221020212107. The reversal of 21221020212010 is 1021202012212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19927179936169 + 1293840275841 = 4463987^2 + 1137471^2 .

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, 10505454541 + ... + 10505456560.

Almost surely, 2^{21221020212010} is an apocalyptic number.

21221020212010 is a deficient number, since it is larger than the sum of its proper divisors (17355012571262).

21221020212010 is a wasteful number, since it uses less digits than its factorization.

21221020212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21010911209.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221020212010 its reverse (1021202012212), we get a palindrome (22242222224222).

It can be divided in two parts, 212210202 and 12010, that added together give a palindrome (212222212).

The spelling of 21221020212010 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred twelve thousand, ten".