20122421464 has 8 divisors (see below), whose sum is σ = 37729540260. Its totient is φ = 10061210728.

The previous prime is 20122421461. The next prime is 20122421497. The reversal of 20122421464 is 46412422102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122421461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257651334 + ... + 1257651349.

Almost surely, 2^20122421464 is an apocalyptic number.

It is an amenable number.

20122421464 is a deficient number, since it is larger than the sum of its proper divisors (17607118796).

20122421464 is a wasteful number, since it uses less digits than its factorization.

20122421464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515302689 (or 2515302685 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 20122421464 its reverse (46412422102), we get a palindrome (66534843566).

The spelling of 20122421464 in words is "twenty billion, one hundred twenty-two million, four hundred twenty-one thousand, four hundred sixty-four".