21021221020010 has 8 divisors (see below), whose sum is σ = 37838197836036. Its totient is φ = 8408488408000.

The previous prime is 21021221019979. The next prime is 21021221020027. The reversal of 21021221020010 is 1002012212012.

It can be written as a sum of positive squares in 2 ways, for example, as 20991159355321 + 30061664689 = 4581611^2 + 173383^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21021221020010² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051061050991 + ... + 1051061051010.

Almost surely, 2^{21021221020010} is an apocalyptic number.

21021221020010 is a deficient number, since it is larger than the sum of its proper divisors (16816976816026).

21021221020010 is a wasteful number, since it uses less digits than its factorization.

21021221020010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102122102008.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021221020010 its reverse (1002012212012), we get a palindrome (22023233232022).

The spelling of 21021221020010 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-one million, twenty thousand, ten".