20401421519 has 2 divisors, whose sum is σ = 20401421520. Its totient is φ = 20401421518.

The previous prime is 20401421431. The next prime is 20401421539. The reversal of 20401421519 is 91512410402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20401421519 - 2²⁰ = 20400372943 is a prime.

It is a super-2 number, since 2×20401421519² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20401421491 and 20401421500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20401421539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200710759 + 10200710760.

It is an arithmetic number, because the mean of its divisors is an integer number (10200710760).

Almost surely, 2^20401421519 is an apocalyptic number.

20401421519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20401421519 is an equidigital number, since it uses as much as digits as its factorization.

20401421519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The spelling of 20401421519 in words is "twenty billion, four hundred one million, four hundred twenty-one thousand, five hundred nineteen".