21841437970 has 16 divisors (see below), whose sum is σ = 42888642048. Its totient is φ = 7942341040.

The previous prime is 21841437967. The next prime is 21841437979. The reversal of 21841437970 is 7973414812.

It is a self number, because there is not a number n which added to its sum of digits gives 21841437970.

It is not an unprimeable number, because it can be changed into a prime (21841437979) 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 7 ways as a sum of consecutive naturals, for example, 99279154 + ... + 99279373.

It is an arithmetic number, because the mean of its divisors is an integer number (2680540128).

Almost surely, 2^21841437970 is an apocalyptic number.

21841437970 is a deficient number, since it is larger than the sum of its proper divisors (21047204078).

21841437970 is a wasteful number, since it uses less digits than its factorization.

21841437970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198558545.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 21841437970 in words is "twenty-one billion, eight hundred forty-one million, four hundred thirty-seven thousand, nine hundred seventy".