102120221210021 has 16 divisors (see below), whose sum is σ = 124374251188224. Its totient is φ = 81944493609264.

The previous prime is 102120221209957. The next prime is 102120221210057. The reversal of 102120221210021 is 120012122021201.

It is not a de Polignac number, because 102120221210021 - 2⁶ = 102120221209957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102120221210621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6747727415 + ... + 6747742548.

It is an arithmetic number, because the mean of its divisors is an integer number (7773390699264).

Almost surely, 2^{102120221210021} is an apocalyptic number.

It is an amenable number.

102120221210021 is a deficient number, since it is larger than the sum of its proper divisors (22254029978203).

102120221210021 is a wasteful number, since it uses less digits than its factorization.

102120221210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13495470040.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102120221210021 its reverse (120012122021201), we get a palindrome (222132343231222).

The spelling of 102120221210021 in words is "one hundred two trillion, one hundred twenty billion, two hundred twenty-one million, two hundred ten thousand, twenty-one".