21007420174 has 32 divisors (see below), whose sum is σ = 34409825856. Its totient is φ = 9560816640.

The previous prime is 21007420099. The next prime is 21007420193. The reversal of 21007420174 is 47102470012.

It is a congruent number.

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, 683559 + ... + 713629.

It is an arithmetic number, because the mean of its divisors is an integer number (1075307058).

Almost surely, 2^21007420174 is an apocalyptic number.

21007420174 is a deficient number, since it is larger than the sum of its proper divisors (13402405682).

21007420174 is a wasteful number, since it uses less digits than its factorization.

21007420174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30460.

The product of its (nonzero) digits is 3136, while the sum is 28.

Adding to 21007420174 its reverse (47102470012), we get a palindrome (68109890186).

The spelling of 21007420174 in words is "twenty-one billion, seven million, four hundred twenty thousand, one hundred seventy-four".