19621117950 has 48 divisors (see below), whose sum is σ = 55611857280. Its totient is φ = 4484826720.

The previous prime is 19621117889. The next prime is 19621117951. The reversal of 19621117950 is 5971112691.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19621117951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9342340 + ... + 9344439.

It is an arithmetic number, because the mean of its divisors is an integer number (1158580360).

Almost surely, 2^19621117950 is an apocalyptic number.

19621117950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19621117950 is an abundant number, since it is smaller than the sum of its proper divisors (35990739330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19621117950 is a wasteful number, since it uses less digits than its factorization.

19621117950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18686801 (or 18686796 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 42.

The spelling of 19621117950 in words is "nineteen billion, six hundred twenty-one million, one hundred seventeen thousand, nine hundred fifty".