21651434246644 has 12 divisors (see below), whose sum is σ = 39884220980800. Its totient is φ = 10255942537848.

The previous prime is 21651434246597. The next prime is 21651434246653. The reversal of 21651434246644 is 44664243415612.

It is a junction number, because it is equal to n+sod(n) for n = 21651434246591 and 21651434246600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142443646284 + ... + 142443646435.

Almost surely, 2^{21651434246644} is an apocalyptic number.

It is an amenable number.

21651434246644 is a deficient number, since it is larger than the sum of its proper divisors (18232786734156).

21651434246644 is a wasteful number, since it uses less digits than its factorization.

21651434246644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284887292742 (or 284887292740 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 52.

The spelling of 21651434246644 in words is "twenty-one trillion, six hundred fifty-one billion, four hundred thirty-four million, two hundred forty-six thousand, six hundred forty-four".