20121021010 has 64 divisors (see below), whose sum is σ = 38040274944. Its totient is φ = 7654694400.

The previous prime is 20121021001. The next prime is 20121021031. The reversal of 20121021010 is 1012012102.

It is a super-2 number, since 2×20121021010² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5220244 + ... + 5224096.

It is an arithmetic number, because the mean of its divisors is an integer number (594379296).

Almost surely, 2^20121021010 is an apocalyptic number.

20121021010 is a deficient number, since it is larger than the sum of its proper divisors (17919253934).

20121021010 is a wasteful number, since it uses less digits than its factorization.

20121021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4219.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20121021010 its reverse (1012012102), we get a palindrome (21133033112).

The spelling of 20121021010 in words is "twenty billion, one hundred twenty-one million, twenty-one thousand, ten".