21990101010 has 32 divisors (see below), whose sum is σ = 52786330560. Its totient is φ = 5862906048.

The previous prime is 21990101009. The next prime is 21990101017. The reversal of 21990101010 is 1010109912.

21990101010 is a modest number, since divided by 101010 gives 21990 as remainder.

It is not an unprimeable number, because it can be changed into a prime (21990101017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95956 + ... + 230624.

It is an arithmetic number, because the mean of its divisors is an integer number (1649572830).

Almost surely, 2^21990101010 is an apocalyptic number.

21990101010 is an abundant number, since it is smaller than the sum of its proper divisors (30796229550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21990101010 is a wasteful number, since it uses less digits than its factorization.

21990101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140122.

The product of its (nonzero) digits is 162, while the sum is 24.

The spelling of 21990101010 in words is "twenty-one billion, nine hundred ninety million, one hundred one thousand, ten".