21999999950 has 12 divisors (see below), whose sum is σ = 40920000000. Its totient is φ = 8799999960.

The previous prime is 21999999929. The next prime is 21999999971. The reversal of 21999999950 is 5999999912.

It is an interprime number because it is at equal distance from previous prime (21999999929) and next prime (21999999971).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219999950 + ... + 220000049.

It is an arithmetic number, because the mean of its divisors is an integer number (3410000000).

Almost surely, 2^21999999950 is an apocalyptic number.

21999999950 is a deficient number, since it is larger than the sum of its proper divisors (18920000050).

21999999950 is a wasteful number, since it uses less digits than its factorization.

21999999950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440000011 (or 440000006 counting only the distinct ones).

The product of its (nonzero) digits is 47829690, while the sum is 71.

The spelling of 21999999950 in words is "twenty-one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty".