1621772037044 has 12 divisors (see below), whose sum is σ = 2838160164000. Its totient is φ = 810869133048.

The previous prime is 1621772037029. The next prime is 1621772037113. The reversal of 1621772037044 is 4407302771261.

It is a junction number, because it is equal to n+sod(n) for n = 1621772036986 and 1621772037004.

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, 4004024 + ... + 4390415.

It is an arithmetic number, because the mean of its divisors is an integer number (236513347000).

Almost surely, 2^{1621772037044} is an apocalyptic number.

It is an amenable number.

1621772037044 is a deficient number, since it is larger than the sum of its proper divisors (1216388126956).

1621772037044 is a wasteful number, since it uses less digits than its factorization.

1621772037044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8442742 (or 8442740 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 44.

The spelling of 1621772037044 in words is "one trillion, six hundred twenty-one billion, seven hundred seventy-two million, thirty-seven thousand, forty-four".