21221019974 has 32 divisors (see below), whose sum is σ = 40188441600. Its totient is φ = 8163267840.

The previous prime is 21221019971. The next prime is 21221019979. The reversal of 21221019974 is 47991012212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221019971) 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, 859979 + ... + 884310.

It is an arithmetic number, because the mean of its divisors is an integer number (1255888800).

Almost surely, 2^21221019974 is an apocalyptic number.

21221019974 is a deficient number, since it is larger than the sum of its proper divisors (18967421626).

21221019974 is a wasteful number, since it uses less digits than its factorization.

21221019974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744388.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 21221019974 in words is "twenty-one billion, two hundred twenty-one million, nineteen thousand, nine hundred seventy-four".