219723949011 has 128 divisors (see below), whose sum is σ = 371290521600. Its totient is φ = 112806120960.

The previous prime is 219723948991. The next prime is 219723949019. The reversal of 219723949011 is 110949327912.

It is not a de Polignac number, because 219723949011 - 2²¹ = 219721851859 is a prime.

It is a super-2 number, since 2×219723949011² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (219723949019) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 76106610 + ... + 76109496.

It is an arithmetic number, because the mean of its divisors is an integer number (2900707200).

Almost surely, 2^219723949011 is an apocalyptic number.

219723949011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

219723949011 is a deficient number, since it is larger than the sum of its proper divisors (151566572589).

219723949011 is a wasteful number, since it uses less digits than its factorization.

219723949011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089.

The product of its (nonzero) digits is 244944, while the sum is 48.

The spelling of 219723949011 in words is "two hundred nineteen billion, seven hundred twenty-three million, nine hundred forty-nine thousand, eleven".