21811420770 has 32 divisors (see below), whose sum is σ = 52660879488. Its totient is φ = 5781548928.

The previous prime is 21811420769. The next prime is 21811420777. The reversal of 21811420770 is 7702411812.

21811420770 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21811420777) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2171779 + ... + 2181798.

It is an arithmetic number, because the mean of its divisors is an integer number (1645652484).

Almost surely, 2^21811420770 is an apocalyptic number.

21811420770 is an abundant number, since it is smaller than the sum of its proper divisors (30849458718).

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

21811420770 is a wasteful number, since it uses less digits than its factorization.

21811420770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353754.

The product of its (nonzero) digits is 6272, while the sum is 33.

The spelling of 21811420770 in words is "twenty-one billion, eight hundred eleven million, four hundred twenty thousand, seven hundred seventy".