21003060278 has 16 divisors (see below), whose sum is σ = 33570280224. Its totient is φ = 9820836480.

The previous prime is 21003060271. The next prime is 21003060391. The reversal of 21003060278 is 87206030012.

It is a happy number.

It is a super-2 number, since 2×21003060278² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21003060278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003060271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1961978 + ... + 1972653.

It is an arithmetic number, because the mean of its divisors is an integer number (2098142514).

Almost surely, 2^21003060278 is an apocalyptic number.

21003060278 is a deficient number, since it is larger than the sum of its proper divisors (12567219946).

21003060278 is a wasteful number, since it uses less digits than its factorization.

21003060278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3934807.

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 21003060278 in words is "twenty-one billion, three million, sixty thousand, two hundred seventy-eight".