102121234243021 has 32 divisors (see below), whose sum is σ = 121620242016000. Its totient is φ = 83894252262912.

The previous prime is 102121234243013. The next prime is 102121234243031. The reversal of 102121234243021 is 120342432121201.

It is not a de Polignac number, because 102121234243021 - 2³ = 102121234243013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121234243031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 202261275 + ... + 202765543.

It is an arithmetic number, because the mean of its divisors is an integer number (3800632563000).

Almost surely, 2^{102121234243021} is an apocalyptic number.

It is an amenable number.

102121234243021 is a deficient number, since it is larger than the sum of its proper divisors (19499007772979).

102121234243021 is a wasteful number, since it uses less digits than its factorization.

102121234243021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511621.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 102121234243021 its reverse (120342432121201), we get a palindrome (222463666364222).

The spelling of 102121234243021 in words is "one hundred two trillion, one hundred twenty-one billion, two hundred thirty-four million, two hundred forty-three thousand, twenty-one".