21078537370 has 32 divisors (see below), whose sum is σ = 41396567616. Its totient is φ = 7663814400.

The previous prime is 21078537367. The next prime is 21078537383. The reversal of 21078537370 is 7373587012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1455465 + ... + 1469875.

It is an arithmetic number, because the mean of its divisors is an integer number (1293642738).

Almost surely, 2^21078537370 is an apocalyptic number.

21078537370 is a deficient number, since it is larger than the sum of its proper divisors (20318030246).

21078537370 is a wasteful number, since it uses less digits than its factorization.

21078537370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27726.

The product of its (nonzero) digits is 246960, while the sum is 43.

The spelling of 21078537370 in words is "twenty-one billion, seventy-eight million, five hundred thirty-seven thousand, three hundred seventy".