19121420040 has 32 divisors (see below), whose sum is σ = 57364260480. Its totient is φ = 5099045312.

The previous prime is 19121420023. The next prime is 19121420057. The reversal of 19121420040 is 4002412191.

It is an interprime number because it is at equal distance from previous prime (19121420023) and next prime (19121420057).

It is a super-2 number, since 2×19121420040² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79672464 + ... + 79672703.

It is an arithmetic number, because the mean of its divisors is an integer number (1792633140).

Almost surely, 2^19121420040 is an apocalyptic number.

19121420040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19121420040 is an abundant number, since it is smaller than the sum of its proper divisors (38242840440).

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

19121420040 is a wasteful number, since it uses less digits than its factorization.

19121420040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159345181 (or 159345177 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 19121420040 in words is "nineteen billion, one hundred twenty-one million, four hundred twenty thousand, forty".