19921001210 has 16 divisors (see below), whose sum is σ = 39117602592. Its totient is φ = 7244000400.

The previous prime is 19921001209. The next prime is 19921001213. The reversal of 19921001210 is 1210012991.

It is a self number, because there is not a number n which added to its sum of digits gives 19921001210.

It is not an unprimeable number, because it can be changed into a prime (19921001213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90549896 + ... + 90550115.

It is an arithmetic number, because the mean of its divisors is an integer number (2444850162).

Almost surely, 2^19921001210 is an apocalyptic number.

19921001210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19921001210 is a deficient number, since it is larger than the sum of its proper divisors (19196601382).

19921001210 is a wasteful number, since it uses less digits than its factorization.

19921001210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181100029.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 19921001210 in words is "nineteen billion, nine hundred twenty-one million, one thousand, two hundred ten".