20012121010 has 16 divisors (see below), whose sum is σ = 41167791936. Its totient is φ = 6861298608.

The previous prime is 20012121007. The next prime is 20012121043. The reversal of 20012121010 is 1012121002.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142943652 + ... + 142943791.

It is an arithmetic number, because the mean of its divisors is an integer number (2572986996).

Almost surely, 2^20012121010 is an apocalyptic number.

20012121010 is an abundant number, since it is smaller than the sum of its proper divisors (21155670926).

20012121010 is a wasteful number, since it uses less digits than its factorization.

20012121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285887457.

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

Adding to 20012121010 its reverse (1012121002), we get a palindrome (21024242012).

The spelling of 20012121010 in words is "twenty billion, twelve million, one hundred twenty-one thousand, ten".