211220010109978 has 64 divisors (see below), whose sum is σ = 337048724678400. Its totient is φ = 99096914076160.

The previous prime is 211220010109961. The next prime is 211220010109993. The reversal of 211220010109978 is 879901010022112.

It is a happy number.

It is a super-2 number, since 2×211220010109978² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 674394051 + ... + 674707177.

It is an arithmetic number, because the mean of its divisors is an integer number (5266386323100).

Almost surely, 2^{211220010109978} is an apocalyptic number.

211220010109978 is a deficient number, since it is larger than the sum of its proper divisors (125828714568422).

211220010109978 is a wasteful number, since it uses less digits than its factorization.

211220010109978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314295.

The product of its (nonzero) digits is 36288, while the sum is 43.

The spelling of 211220010109978 in words is "two hundred eleven trillion, two hundred twenty billion, ten million, one hundred nine thousand, nine hundred seventy-eight".